Menghitung k-map untuk set data

K-map sangat mirip dengan k-anonymity, kecuali bahwa k-map mengasumsikan bahwa penyerang kemungkinan besar tidak mengetahui siapa yang ada dalam set data. Gunakan k-map jika set data Anda relatif kecil, atau jika tingkat upaya yang diperlukan untuk menggeneralisasi atribut terlalu tinggi.

Sama seperti k-anonymity, k-map mengharuskan Anda menentukan kolom mana dari database Anda yang merupakan quasi-identifier. Dengan melakukan ini, Anda menyatakan data apa yang kemungkinan besar akan digunakan penyerang untuk mengidentifikasi ulang subjek. Selain itu, menghitung nilai peta k memerlukan set data untuk mengidentifikasi ulang: tabel yang lebih besar untuk membandingkan baris dalam set data asli.

Topik ini menunjukkan cara menghitung nilai peta k untuk set data menggunakan Sensitive Data Protection. Untuk mengetahui informasi selengkapnya tentang k-map atau analisis risiko secara umum, lihat topik konsep analisis risiko sebelum melanjutkan.

Sebelum memulai

Sebelum melanjutkan, pastikan Anda telah melakukan hal berikut:

  1. Login ke Akun Google Anda.
  2. Di konsol Google Cloud , pada halaman pemilih project, pilih atau buat project Google Cloud .
    3. Buka pemilih project
  3. Pastikan penagihan diaktifkan untuk project Google Cloud Anda. Pelajari cara mengonfirmasi bahwa penagihan diaktifkan untuk project Anda.
  4. Mengaktifkan Sensitive Data Protection.
    5. Mengaktifkan Sensitive Data Protection

  5. Pilih set data BigQuery untuk dianalisis. Sensitive Data Protection memperkirakan metrik peta k dengan memindai tabel BigQuery.
  6. Tentukan jenis set data yang ingin Anda gunakan untuk membuat model set data serangan. Untuk mengetahui informasi selengkapnya, lihat halaman referensi untuk objek KMapEstimationConfig, serta Istilah dan teknik analisis risiko.

Menghitung estimasi k-map

Anda dapat memperkirakan nilai peta k menggunakan Sensitive Data Protection, yang menggunakan model statistik untuk memperkirakan set data re-identifikasi. Hal ini berbeda dengan metode analisis risiko lainnya, yang set data serangannya diketahui secara eksplisit. Bergantung pada jenis data, Sensitive Data Protection menggunakan set data yang tersedia untuk umum (misalnya, dari Sensus AS) atau model statistik kustom (misalnya, satu atau beberapa tabel BigQuery yang Anda tentukan), atau mengekstrapolasi dari distribusi nilai dalam set data input Anda. Untuk informasi selengkapnya, lihat halaman referensi untuk objek KMapEstimationConfig.

Untuk menghitung estimasi peta k menggunakan Sensitive Data Protection, konfigurasikan tugas risiko terlebih dahulu. Buat permintaan ke resource projects.dlpJobs, dengan PROJECT_ID menunjukkan ID project Anda:

https://dlp.googleapis.com/v2/projects/PROJECT_ID/dlpJobs

Permintaan berisi objek RiskAnalysisJobConfig, yang terdiri dari hal berikut:

  • Objek PrivacyMetric. Di sinilah Anda menentukan bahwa Anda ingin menghitung k-map dengan menentukan objek KMapEstimationConfig yang berisi hal berikut:

    • quasiIds[]: Wajib diisi. Kolom (objek TaggedField) yang dianggap sebagai quasi-identifier untuk dipindai dan digunakan untuk menghitung k-map. Tidak boleh ada dua kolom yang memiliki tag yang sama. Ini dapat berupa salah satu dari hal berikut:

      • infoType: Hal ini menyebabkan Sensitive Data Protection menggunakan set data publik yang relevan sebagai model statistik populasi, termasuk kode pos AS, kode wilayah, usia, dan gender.
      • infoType kustom: Tag kustom tempat Anda menunjukkan tabel tambahan (objek AuxiliaryTable) yang berisi informasi statistik tentang kemungkinan nilai kolom ini.
      • Tag inferred: Jika tidak ada tag semantik yang ditunjukkan, tentukan inferred. Sensitive Data Protection menyimpulkan model statistik dari distribusi nilai dalam data input.

    • regionCode: Kode wilayah ISO 3166-1 alpha-2 untuk digunakan Sensitive Data Protection dalam pemodelan statistik. Nilai ini diperlukan jika tidak ada kolom yang diberi tag dengan infoType khusus wilayah (misalnya, kode pos AS) atau kode wilayah.

    • auxiliaryTables[]: Tabel tambahan (objek AuxiliaryTable) yang akan digunakan dalam analisis. Setiap tag kustom yang digunakan untuk memberi tag pada kolom quasi-identifier (dari quasiIds[]) harus muncul di tepat satu kolom dari satu tabel tambahan.

  • Objek BigQueryTable. Tentukan tabel BigQuery yang akan dipindai dengan menyertakan semua hal berikut:

    • projectId: Project ID untuk project yang berisi tabel.
    • datasetId: ID set data tabel.
    • tableId: Nama tabel.

  • Satu set yang terdiri dari satu atau beberapa objek Action, yang mewakili tindakan yang akan dijalankan, dalam urutan yang diberikan, pada penyelesaian tugas. Setiap objek Action dapat berisi salah satu tindakan berikut:

Contoh kode

Berikut adalah kode contoh dalam beberapa bahasa yang menunjukkan cara menggunakan Sensitive Data Protection untuk menghitung nilai peta k.

Go

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 

import (
	"context"
	"fmt"
	"io"
	"strings"
	"time"

	dlp "cloud.google.com/go/dlp/apiv2"
	"cloud.google.com/go/dlp/apiv2/dlppb"
	"cloud.google.com/go/pubsub"
	"github.com/golang/protobuf/ptypes/empty"
)

// riskKMap runs K Map on the given data.
func riskKMap(w io.Writer, projectID, dataProject, pubSubTopic, pubSubSub, datasetID, tableID, region string, columnNames ...string) error {
	// projectID := "my-project-id"
	// dataProject := "bigquery-public-data"
	// pubSubTopic := "dlp-risk-sample-topic"
	// pubSubSub := "dlp-risk-sample-sub"
	// datasetID := "san_francisco"
	// tableID := "bikeshare_trips"
	// region := "US"
	// columnNames := "zip_code"
	ctx := context.Background()
	client, err := dlp.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("dlp.NewClient: %w", err)
	}

	// Create a PubSub Client used to listen for when the inspect job finishes.
	pubsubClient, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return err
	}
	defer pubsubClient.Close()

	// Create a PubSub subscription we can use to listen for messages.
	// Create the Topic if it doesn't exist.
	t := pubsubClient.Topic(pubSubTopic)
	topicExists, err := t.Exists(ctx)
	if err != nil {
		return err
	}
	if !topicExists {
		if t, err = pubsubClient.CreateTopic(ctx, pubSubTopic); err != nil {
			return err
		}
	}

	// Create the Subscription if it doesn't exist.
	s := pubsubClient.Subscription(pubSubSub)
	subExists, err := s.Exists(ctx)
	if err != nil {
		return err
	}
	if !subExists {
		if s, err = pubsubClient.CreateSubscription(ctx, pubSubSub, pubsub.SubscriptionConfig{Topic: t}); err != nil {
			return err
		}
	}

	// topic is the PubSub topic string where messages should be sent.
	topic := "projects/" + projectID + "/topics/" + pubSubTopic

	// Build the QuasiID slice.
	var q []*dlppb.PrivacyMetric_KMapEstimationConfig_TaggedField
	for _, c := range columnNames {
		q = append(q, &dlppb.PrivacyMetric_KMapEstimationConfig_TaggedField{
			Field: &dlppb.FieldId{
				Name: c,
			},
			Tag: &dlppb.PrivacyMetric_KMapEstimationConfig_TaggedField_Inferred{
				Inferred: &empty.Empty{},
			},
		})
	}

	// Create a configured request.
	req := &dlppb.CreateDlpJobRequest{
		Parent: fmt.Sprintf("projects/%s/locations/global", projectID),
		Job: &dlppb.CreateDlpJobRequest_RiskJob{
			RiskJob: &dlppb.RiskAnalysisJobConfig{
				// PrivacyMetric configures what to compute.
				PrivacyMetric: &dlppb.PrivacyMetric{
					Type: &dlppb.PrivacyMetric_KMapEstimationConfig_{
						KMapEstimationConfig: &dlppb.PrivacyMetric_KMapEstimationConfig{
							QuasiIds:   q,
							RegionCode: region,
						},
					},
				},
				// SourceTable describes where to find the data.
				SourceTable: &dlppb.BigQueryTable{
					ProjectId: dataProject,
					DatasetId: datasetID,
					TableId:   tableID,
				},
				// Send a message to PubSub using Actions.
				Actions: []*dlppb.Action{
					{
						Action: &dlppb.Action_PubSub{
							PubSub: &dlppb.Action_PublishToPubSub{
								Topic: topic,
							},
						},
					},
				},
			},
		},
	}
	// Create the risk job.
	j, err := client.CreateDlpJob(ctx, req)
	if err != nil {
		return fmt.Errorf("CreateDlpJob: %w", err)
	}
	fmt.Fprintf(w, "Created job: %v\n", j.GetName())
	// Wait for the risk job to finish by waiting for a PubSub message.
	// This only waits for 10 minutes. For long jobs, consider using a truly
	// asynchronous execution model such as Cloud Functions.
	ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
	defer cancel()
	err = s.Receive(ctx, func(ctx context.Context, msg *pubsub.Message) {
		// If this is the wrong job, do not process the result.

		if msg.Attributes["DlpJobName"] != j.GetName() {
			msg.Nack()
			return
		}
		msg.Ack()
		time.Sleep(500 * time.Millisecond)
		j, err := client.GetDlpJob(ctx, &dlppb.GetDlpJobRequest{
			Name: j.GetName(),
		})

		if err != nil {
			fmt.Fprintf(w, "GetDlpJob: %v", err)
			return
		}
		h := j.GetRiskDetails().GetKMapEstimationResult().GetKMapEstimationHistogram()
		for i, b := range h {
			fmt.Fprintf(w, "Histogram bucket %v\n", i)
			fmt.Fprintf(w, "  Anonymity range: [%v,%v]\n", b.GetMaxAnonymity(), b.GetMaxAnonymity())
			fmt.Fprintf(w, "  %v unique values total\n", b.GetBucketSize())
			for _, v := range b.GetBucketValues() {
				var qvs []string
				for _, qv := range v.GetQuasiIdsValues() {
					qvs = append(qvs, qv.String())
				}
				fmt.Fprintf(w, "    QuasiID values: %s\n", strings.Join(qvs, ", "))
				fmt.Fprintf(w, "    Estimated anonymity: %v\n", v.GetEstimatedAnonymity())
			}
		}
		// Stop listening for more messages.
		cancel()
	})
	if err != nil {
		return fmt.Errorf("Recieve: %w", err)
	}
	return nil
}

Java

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 


import com.google.api.core.SettableApiFuture;
import com.google.cloud.dlp.v2.DlpServiceClient;
import com.google.cloud.pubsub.v1.AckReplyConsumer;
import com.google.cloud.pubsub.v1.MessageReceiver;
import com.google.cloud.pubsub.v1.Subscriber;
import com.google.privacy.dlp.v2.Action;
import com.google.privacy.dlp.v2.Action.PublishToPubSub;
import com.google.privacy.dlp.v2.AnalyzeDataSourceRiskDetails.KMapEstimationResult;
import com.google.privacy.dlp.v2.AnalyzeDataSourceRiskDetails.KMapEstimationResult.KMapEstimationHistogramBucket;
import com.google.privacy.dlp.v2.AnalyzeDataSourceRiskDetails.KMapEstimationResult.KMapEstimationQuasiIdValues;
import com.google.privacy.dlp.v2.BigQueryTable;
import com.google.privacy.dlp.v2.CreateDlpJobRequest;
import com.google.privacy.dlp.v2.DlpJob;
import com.google.privacy.dlp.v2.FieldId;
import com.google.privacy.dlp.v2.GetDlpJobRequest;
import com.google.privacy.dlp.v2.InfoType;
import com.google.privacy.dlp.v2.LocationName;
import com.google.privacy.dlp.v2.PrivacyMetric;
import com.google.privacy.dlp.v2.PrivacyMetric.KMapEstimationConfig;
import com.google.privacy.dlp.v2.PrivacyMetric.KMapEstimationConfig.TaggedField;
import com.google.privacy.dlp.v2.RiskAnalysisJobConfig;
import com.google.pubsub.v1.ProjectSubscriptionName;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.PubsubMessage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.stream.Collectors;

@SuppressWarnings("checkstyle:AbbreviationAsWordInName")
class RiskAnalysisKMap {

  public static void main(String[] args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String datasetId = "your-bigquery-dataset-id";
    String tableId = "your-bigquery-table-id";
    String topicId = "pub-sub-topic";
    String subscriptionId = "pub-sub-subscription";
    calculateKMap(projectId, datasetId, tableId, topicId, subscriptionId);
  }

  public static void calculateKMap(
      String projectId, String datasetId, String tableId, String topicId, String subscriptionId)
      throws ExecutionException, InterruptedException, IOException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the "close" method on the client to safely clean up any remaining background resources.
    try (DlpServiceClient dlpServiceClient = DlpServiceClient.create()) {
      // Specify the BigQuery table to analyze
      BigQueryTable bigQueryTable =
          BigQueryTable.newBuilder()
              .setProjectId(projectId)
              .setDatasetId(datasetId)
              .setTableId(tableId)
              .build();

      // These values represent the column names of quasi-identifiers to analyze
      List<String> quasiIds = Arrays.asList("Age", "Gender");

      // These values represent the info types corresponding to the quasi-identifiers above
      List<String> infoTypeNames = Arrays.asList("AGE", "GENDER");

      // Tag each of the quasiId column names with its corresponding infoType
      List<InfoType> infoTypes =
          infoTypeNames.stream()
              .map(it -> InfoType.newBuilder().setName(it).build())
              .collect(Collectors.toList());

      if (quasiIds.size() != infoTypes.size()) {
        throw new IllegalArgumentException("The numbers of quasi-IDs and infoTypes must be equal!");
      }

      List<TaggedField> taggedFields = new ArrayList<TaggedField>();
      for (int i = 0; i < quasiIds.size(); i++) {
        TaggedField taggedField =
            TaggedField.newBuilder()
                .setField(FieldId.newBuilder().setName(quasiIds.get(i)).build())
                .setInfoType(infoTypes.get(i))
                .build();
        taggedFields.add(taggedField);
      }

      // The k-map distribution region can be specified by any ISO-3166-1 region code.
      String regionCode = "US";

      // Configure the privacy metric for the job
      KMapEstimationConfig kmapConfig =
          KMapEstimationConfig.newBuilder()
              .addAllQuasiIds(taggedFields)
              .setRegionCode(regionCode)
              .build();
      PrivacyMetric privacyMetric =
          PrivacyMetric.newBuilder().setKMapEstimationConfig(kmapConfig).build();

      // Create action to publish job status notifications over Google Cloud Pub/Sub
      ProjectTopicName topicName = ProjectTopicName.of(projectId, topicId);
      PublishToPubSub publishToPubSub =
          PublishToPubSub.newBuilder().setTopic(topicName.toString()).build();
      Action action = Action.newBuilder().setPubSub(publishToPubSub).build();

      // Configure the risk analysis job to perform
      RiskAnalysisJobConfig riskAnalysisJobConfig =
          RiskAnalysisJobConfig.newBuilder()
              .setSourceTable(bigQueryTable)
              .setPrivacyMetric(privacyMetric)
              .addActions(action)
              .build();

      // Build the request to be sent by the client
      CreateDlpJobRequest createDlpJobRequest =
          CreateDlpJobRequest.newBuilder()
              .setParent(LocationName.of(projectId, "global").toString())
              .setRiskJob(riskAnalysisJobConfig)
              .build();

      // Send the request to the API using the client
      DlpJob dlpJob = dlpServiceClient.createDlpJob(createDlpJobRequest);

      // Set up a Pub/Sub subscriber to listen on the job completion status
      final SettableApiFuture<Boolean> done = SettableApiFuture.create();

      ProjectSubscriptionName subscriptionName =
          ProjectSubscriptionName.of(projectId, subscriptionId);

      MessageReceiver messageHandler =
          (PubsubMessage pubsubMessage, AckReplyConsumer ackReplyConsumer) -> {
            handleMessage(dlpJob, done, pubsubMessage, ackReplyConsumer);
          };
      Subscriber subscriber = Subscriber.newBuilder(subscriptionName, messageHandler).build();
      subscriber.startAsync();

      // Wait for job completion semi-synchronously
      // For long jobs, consider using a truly asynchronous execution model such as Cloud Functions
      try {
        done.get(15, TimeUnit.MINUTES);
      } catch (TimeoutException e) {
        System.out.println("Job was not completed after 15 minutes.");
        return;
      } finally {
        subscriber.stopAsync();
        subscriber.awaitTerminated();
      }

      // Build a request to get the completed job
      GetDlpJobRequest getDlpJobRequest =
          GetDlpJobRequest.newBuilder().setName(dlpJob.getName()).build();

      // Retrieve completed job status
      DlpJob completedJob = dlpServiceClient.getDlpJob(getDlpJobRequest);
      System.out.println("Job status: " + completedJob.getState());
      System.out.println("Job name: " + dlpJob.getName());

      // Get the result and parse through and process the information
      KMapEstimationResult kmapResult = completedJob.getRiskDetails().getKMapEstimationResult();

      for (KMapEstimationHistogramBucket result : kmapResult.getKMapEstimationHistogramList()) {
        System.out.printf(
            "\tAnonymity range: [%d, %d]\n", result.getMinAnonymity(), result.getMaxAnonymity());
        System.out.printf("\tSize: %d\n", result.getBucketSize());

        for (KMapEstimationQuasiIdValues valueBucket : result.getBucketValuesList()) {
          List<String> quasiIdValues =
              valueBucket.getQuasiIdsValuesList().stream()
                  .map(
                      value -> {
                        String s = value.toString();
                        return s.substring(s.indexOf(':') + 1).trim();
                      })
                  .collect(Collectors.toList());

          System.out.printf("\tValues: {%s}\n", String.join(", ", quasiIdValues));
          System.out.printf(
              "\tEstimated k-map anonymity: %d\n", valueBucket.getEstimatedAnonymity());
        }
      }
    }
  }

  // handleMessage injects the job and settableFuture into the message reciever interface
  private static void handleMessage(
      DlpJob job,
      SettableApiFuture<Boolean> done,
      PubsubMessage pubsubMessage,
      AckReplyConsumer ackReplyConsumer) {
    String messageAttribute = pubsubMessage.getAttributesMap().get("DlpJobName");
    if (job.getName().equals(messageAttribute)) {
      done.set(true);
      ackReplyConsumer.ack();
    } else {
      ackReplyConsumer.nack();
    }
  }
}

Node.js

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 

// Import the Google Cloud client libraries
const DLP = require('@google-cloud/dlp');
const {PubSub} = require('@google-cloud/pubsub');

// Instantiates clients
const dlp = new DLP.DlpServiceClient();
const pubsub = new PubSub();

// The project ID to run the API call under
// const projectId = 'my-project';

// The project ID the table is stored under
// This may or (for public datasets) may not equal the calling project ID
// const tableProjectId = 'my-project';

// The ID of the dataset to inspect, e.g. 'my_dataset'
// const datasetId = 'my_dataset';

// The ID of the table to inspect, e.g. 'my_table'
// const tableId = 'my_table';

// The name of the Pub/Sub topic to notify once the job completes
// TODO(developer): create a Pub/Sub topic to use for this
// const topicId = 'MY-PUBSUB-TOPIC'

// The name of the Pub/Sub subscription to use when listening for job
// completion notifications
// TODO(developer): create a Pub/Sub subscription to use for this
// const subscriptionId = 'MY-PUBSUB-SUBSCRIPTION'

// The ISO 3166-1 region code that the data is representative of
// Can be omitted if using a region-specific infoType (such as US_ZIP_5)
// const regionCode = 'USA';

// A set of columns that form a composite key ('quasi-identifiers'), and
// optionally their reidentification distributions
// const quasiIds = [{ field: { name: 'age' }, infoType: { name: 'AGE' }}];
async function kMapEstimationAnalysis() {
  const sourceTable = {
    projectId: tableProjectId,
    datasetId: datasetId,
    tableId: tableId,
  };

  // Construct request for creating a risk analysis job
  const request = {
    parent: `projects/${projectId}/locations/global`,
    riskJob: {
      privacyMetric: {
        kMapEstimationConfig: {
          quasiIds: quasiIds,
          regionCode: regionCode,
        },
      },
      sourceTable: sourceTable,
      actions: [
        {
          pubSub: {
            topic: `projects/${projectId}/topics/${topicId}`,
          },
        },
      ],
    },
  };
  // Create helper function for unpacking values
  const getValue = obj => obj[Object.keys(obj)[0]];

  // Run risk analysis job
  const [topicResponse] = await pubsub.topic(topicId).get();
  const subscription = await topicResponse.subscription(subscriptionId);
  const [jobsResponse] = await dlp.createDlpJob(request);
  const jobName = jobsResponse.name;
  console.log(`Job created. Job name: ${jobName}`);

  // Watch the Pub/Sub topic until the DLP job finishes
  await new Promise((resolve, reject) => {
    const messageHandler = message => {
      if (message.attributes && message.attributes.DlpJobName === jobName) {
        message.ack();
        subscription.removeListener('message', messageHandler);
        subscription.removeListener('error', errorHandler);
        resolve(jobName);
      } else {
        message.nack();
      }
    };

    const errorHandler = err => {
      subscription.removeListener('message', messageHandler);
      subscription.removeListener('error', errorHandler);
      reject(err);
    };

    subscription.on('message', messageHandler);
    subscription.on('error', errorHandler);
  });
  setTimeout(() => {
    console.log(' Waiting for DLP job to fully complete');
  }, 500);
  const [job] = await dlp.getDlpJob({name: jobName});

  const histogramBuckets =
    job.riskDetails.kMapEstimationResult.kMapEstimationHistogram;

  histogramBuckets.forEach((histogramBucket, histogramBucketIdx) => {
    console.log(`Bucket ${histogramBucketIdx}:`);
    console.log(
      `  Anonymity range: [${histogramBucket.minAnonymity}, ${histogramBucket.maxAnonymity}]`
    );
    console.log(`  Size: ${histogramBucket.bucketSize}`);
    histogramBucket.bucketValues.forEach(valueBucket => {
      const values = valueBucket.quasiIdsValues.map(value => getValue(value));
      console.log(`    Values: ${values.join(' ')}`);
      console.log(
        `    Estimated k-map anonymity: ${valueBucket.estimatedAnonymity}`
      );
    });
  });
}

await kMapEstimationAnalysis();

PHP

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 

use Exception;
use Google\Cloud\Dlp\V2\Action;
use Google\Cloud\Dlp\V2\Action\PublishToPubSub;
use Google\Cloud\Dlp\V2\BigQueryTable;
use Google\Cloud\Dlp\V2\Client\DlpServiceClient;
use Google\Cloud\Dlp\V2\CreateDlpJobRequest;
use Google\Cloud\Dlp\V2\DlpJob\JobState;
use Google\Cloud\Dlp\V2\FieldId;
use Google\Cloud\Dlp\V2\GetDlpJobRequest;
use Google\Cloud\Dlp\V2\InfoType;
use Google\Cloud\Dlp\V2\PrivacyMetric;
use Google\Cloud\Dlp\V2\PrivacyMetric\KMapEstimationConfig;
use Google\Cloud\Dlp\V2\PrivacyMetric\KMapEstimationConfig\TaggedField;
use Google\Cloud\Dlp\V2\RiskAnalysisJobConfig;
use Google\Cloud\PubSub\PubSubClient;

/**
 * Computes the k-map risk estimation of a column set in a Google BigQuery table.
 *
 * @param string   $callingProjectId  The project ID to run the API call under
 * @param string   $dataProjectId     The project ID containing the target Datastore
 * @param string   $topicId           The name of the Pub/Sub topic to notify once the job completes
 * @param string   $subscriptionId    The name of the Pub/Sub subscription to use when listening for job
 * @param string   $datasetId         The ID of the dataset to inspect
 * @param string   $tableId           The ID of the table to inspect
 * @param string   $regionCode        The ISO 3166-1 region code that the data is representative of
 * @param string[] $quasiIdNames      Array columns that form a composite key (quasi-identifiers)
 * @param string[] $infoTypes         Array of infoTypes corresponding to the chosen quasi-identifiers
 */
function k_map(
    string $callingProjectId,
    string $dataProjectId,
    string $topicId,
    string $subscriptionId,
    string $datasetId,
    string $tableId,
    string $regionCode,
    array $quasiIdNames,
    array $infoTypes
): void {
    // Instantiate a client.
    $dlp = new DlpServiceClient();
    $pubsub = new PubSubClient();
    $topic = $pubsub->topic($topicId);

    // Verify input
    if (count($infoTypes) != count($quasiIdNames)) {
        throw new Exception('Number of infoTypes and number of quasi-identifiers must be equal!');
    }

    // Map infoTypes to quasi-ids
    $quasiIdObjects = array_map(function ($quasiId, $infoType) {
        $quasiIdField = (new FieldId())
            ->setName($quasiId);

        $quasiIdType = (new InfoType())
            ->setName($infoType);

        $quasiIdObject = (new TaggedField())
            ->setInfoType($quasiIdType)
            ->setField($quasiIdField);

        return $quasiIdObject;
    }, $quasiIdNames, $infoTypes);

    // Construct analysis config
    $statsConfig = (new KMapEstimationConfig())
        ->setQuasiIds($quasiIdObjects)
        ->setRegionCode($regionCode);

    $privacyMetric = (new PrivacyMetric())
        ->setKMapEstimationConfig($statsConfig);

    // Construct items to be analyzed
    $bigqueryTable = (new BigQueryTable())
        ->setProjectId($dataProjectId)
        ->setDatasetId($datasetId)
        ->setTableId($tableId);

    // Construct the action to run when job completes
    $pubSubAction = (new PublishToPubSub())
        ->setTopic($topic->name());

    $action = (new Action())
        ->setPubSub($pubSubAction);

    // Construct risk analysis job config to run
    $riskJob = (new RiskAnalysisJobConfig())
        ->setPrivacyMetric($privacyMetric)
        ->setSourceTable($bigqueryTable)
        ->setActions([$action]);

    // Listen for job notifications via an existing topic/subscription.
    $subscription = $topic->subscription($subscriptionId);

    // Submit request
    $parent = "projects/$callingProjectId/locations/global";
    $createDlpJobRequest = (new CreateDlpJobRequest())
        ->setParent($parent)
        ->setRiskJob($riskJob);
    $job = $dlp->createDlpJob($createDlpJobRequest);

    // Poll Pub/Sub using exponential backoff until job finishes
    // Consider using an asynchronous execution model such as Cloud Functions
    $attempt = 1;
    $startTime = time();
    do {
        foreach ($subscription->pull() as $message) {
            if (
                isset($message->attributes()['DlpJobName']) &&
                $message->attributes()['DlpJobName'] === $job->getName()
            ) {
                $subscription->acknowledge($message);
                // Get the updated job. Loop to avoid race condition with DLP API.
                do {
                    $getDlpJobRequest = (new GetDlpJobRequest())
                        ->setName($job->getName());
                    $job = $dlp->getDlpJob($getDlpJobRequest);
                } while ($job->getState() == JobState::RUNNING);
                break 2; // break from parent do while
            }
        }
        print('Waiting for job to complete' . PHP_EOL);
        // Exponential backoff with max delay of 60 seconds
        sleep(min(60, pow(2, ++$attempt)));
    } while (time() - $startTime < 600); // 10 minute timeout

    // Print finding counts
    printf('Job %s status: %s' . PHP_EOL, $job->getName(), JobState::name($job->getState()));
    switch ($job->getState()) {
        case JobState::DONE:
            $histBuckets = $job->getRiskDetails()->getKMapEstimationResult()->getKMapEstimationHistogram();

            foreach ($histBuckets as $bucketIndex => $histBucket) {
                // Print bucket stats
                printf('Bucket %s:' . PHP_EOL, $bucketIndex);
                printf(
                    '  Anonymity range: [%s, %s]' . PHP_EOL,
                    $histBucket->getMinAnonymity(),
                    $histBucket->getMaxAnonymity()
                );
                printf('  Size: %s' . PHP_EOL, $histBucket->getBucketSize());

                // Print bucket values
                foreach ($histBucket->getBucketValues() as $percent => $valueBucket) {
                    printf(
                        '  Estimated k-map anonymity: %s' . PHP_EOL,
                        $valueBucket->getEstimatedAnonymity()
                    );

                    // Pretty-print quasi-ID values
                    print('  Values: ' . PHP_EOL);
                    foreach ($valueBucket->getQuasiIdsValues() as $index => $value) {
                        print('    ' . $value->serializeToJsonString() . PHP_EOL);
                    }
                }
            }
            break;
        case JobState::FAILED:
            printf('Job %s had errors:' . PHP_EOL, $job->getName());
            $errors = $job->getErrors();
            foreach ($errors as $error) {
                var_dump($error->getDetails());
            }
            break;
        case JobState::PENDING:
            print('Job has not completed. Consider a longer timeout or an asynchronous execution model' . PHP_EOL);
            break;
        default:
            print('Unexpected job state. Most likely, the job is either running or has not yet started.');
    }
}

Python

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 

import concurrent.futures
from typing import List

import google.cloud.dlp
from google.cloud.dlp_v2 import types
import google.cloud.pubsub


def k_map_estimate_analysis(
    project: str,
    table_project_id: str,
    dataset_id: str,
    table_id: str,
    topic_id: str,
    subscription_id: str,
    quasi_ids: List[str],
    info_types: List[str],
    region_code: str = "US",
    timeout: int = 300,
) -> None:
    """Uses the Data Loss Prevention API to compute the k-map risk estimation
        of a column set in a Google BigQuery table.
    Args:
        project: The Google Cloud project id to use as a parent resource.
        table_project_id: The Google Cloud project id where the BigQuery table
            is stored.
        dataset_id: The id of the dataset to inspect.
        table_id: The id of the table to inspect.
        topic_id: The name of the Pub/Sub topic to notify once the job
            completes.
        subscription_id: The name of the Pub/Sub subscription to use when
            listening for job completion notifications.
        quasi_ids: A set of columns that form a composite key and optionally
            their re-identification distributions.
        info_types: Type of information of the quasi_id in order to provide a
            statistical model of population.
        region_code: The ISO 3166-1 region code that the data is representative
            of. Can be omitted if using a region-specific infoType (such as
            US_ZIP_5)
        timeout: The number of seconds to wait for a response from the API.

    Returns:
        None; the response from the API is printed to the terminal.
    """

    # Create helper function for unpacking values
    def get_values(obj: types.Value) -> int:
        return int(obj.integer_value)

    # Instantiate a client.
    dlp = google.cloud.dlp_v2.DlpServiceClient()

    # Convert the project id into full resource ids.
    topic = google.cloud.pubsub.PublisherClient.topic_path(project, topic_id)
    parent = f"projects/{project}/locations/global"

    # Location info of the BigQuery table.
    source_table = {
        "project_id": table_project_id,
        "dataset_id": dataset_id,
        "table_id": table_id,
    }

    # Check that numbers of quasi-ids and info types are equal
    if len(quasi_ids) != len(info_types):
        raise ValueError(
            """Number of infoTypes and number of quasi-identifiers
                            must be equal!"""
        )

    # Convert quasi id list to Protobuf type
    def map_fields(quasi_id: str, info_type: str) -> dict:
        return {"field": {"name": quasi_id}, "info_type": {"name": info_type}}

    quasi_ids = map(map_fields, quasi_ids, info_types)

    # Tell the API where to send a notification when the job is complete.
    actions = [{"pub_sub": {"topic": topic}}]

    # Configure risk analysis job
    # Give the name of the numeric column to compute risk metrics for
    risk_job = {
        "privacy_metric": {
            "k_map_estimation_config": {
                "quasi_ids": quasi_ids,
                "region_code": region_code,
            }
        },
        "source_table": source_table,
        "actions": actions,
    }

    # Call API to start risk analysis job
    operation = dlp.create_dlp_job(request={"parent": parent, "risk_job": risk_job})

    def callback(message: google.cloud.pubsub_v1.subscriber.message.Message) -> None:
        if message.attributes["DlpJobName"] == operation.name:
            # This is the message we're looking for, so acknowledge it.
            message.ack()

            # Now that the job is done, fetch the results and print them.
            job = dlp.get_dlp_job(request={"name": operation.name})
            print(f"Job name: {job.name}")
            histogram_buckets = (
                job.risk_details.k_map_estimation_result.k_map_estimation_histogram
            )
            # Print bucket stats
            for i, bucket in enumerate(histogram_buckets):
                print(f"Bucket {i}:")
                print(
                    "   Anonymity range: [{}, {}]".format(
                        bucket.min_anonymity, bucket.max_anonymity
                    )
                )
                print(f"   Size: {bucket.bucket_size}")
                for value_bucket in bucket.bucket_values:
                    print(
                        "   Values: {}".format(
                            map(get_values, value_bucket.quasi_ids_values)
                        )
                    )
                    print(
                        "   Estimated k-map anonymity: {}".format(
                            value_bucket.estimated_anonymity
                        )
                    )
            subscription.set_result(None)
        else:
            # This is not the message we're looking for.
            message.drop()

    # Create a Pub/Sub client and find the subscription. The subscription is
    # expected to already be listening to the topic.
    subscriber = google.cloud.pubsub.SubscriberClient()
    subscription_path = subscriber.subscription_path(project, subscription_id)
    subscription = subscriber.subscribe(subscription_path, callback)

    try:
        subscription.result(timeout=timeout)
    except concurrent.futures.TimeoutError:
        print(
            "No event received before the timeout. Please verify that the "
            "subscription provided is subscribed to the topic provided."
        )
        subscription.close()

C#

Untuk mempelajari cara menginstal dan menggunakan library klien untuk Sensitive Data Protection, lihat library klien Sensitive Data Protection.

Untuk melakukan autentikasi ke Sensitive Data Protection, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, lihat Menyiapkan autentikasi untuk lingkungan pengembangan lokal. 


using Google.Api.Gax.ResourceNames;
using Google.Cloud.Dlp.V2;
using Google.Cloud.PubSub.V1;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using static Google.Cloud.Dlp.V2.Action.Types;
using static Google.Cloud.Dlp.V2.PrivacyMetric.Types;
using static Google.Cloud.Dlp.V2.PrivacyMetric.Types.KMapEstimationConfig.Types;

public class RiskAnalysisCreateKMap
{
    public static object KMap(
        string callingProjectId,
        string tableProjectId,
        string datasetId,
        string tableId,
        string topicId,
        string subscriptionId,
        IEnumerable<FieldId> quasiIds,
        IEnumerable<InfoType> infoTypes,
        string regionCode)
    {
        var dlp = DlpServiceClient.Create();

        // Construct + submit the job
        var kmapEstimationConfig = new KMapEstimationConfig
        {
            QuasiIds =
                {
                    quasiIds.Zip(
                        infoTypes,
                        (Field, InfoType) => new TaggedField
                        {
                            Field = Field,
                            InfoType = InfoType
                        }
                    )
                },
            RegionCode = regionCode
        };

        var config = new RiskAnalysisJobConfig()
        {
            PrivacyMetric = new PrivacyMetric
            {
                KMapEstimationConfig = kmapEstimationConfig
            },
            SourceTable = new BigQueryTable
            {
                ProjectId = tableProjectId,
                DatasetId = datasetId,
                TableId = tableId
            },
            Actions =
            {
                new Google.Cloud.Dlp.V2.Action
                {
                    PubSub = new PublishToPubSub
                    {
                        Topic = $"projects/{callingProjectId}/topics/{topicId}"
                    }
                }
            }
        };

        var submittedJob = dlp.CreateDlpJob(
            new CreateDlpJobRequest
            {
                ParentAsProjectName = new ProjectName(callingProjectId),
                RiskJob = config
            });

        // Listen to pub/sub for the job
        var subscriptionName = new SubscriptionName(
            callingProjectId,
            subscriptionId);
        var subscriber = SubscriberClient.CreateAsync(
            subscriptionName).Result;

        // SimpleSubscriber runs your message handle function on multiple
        // threads to maximize throughput.
        var done = new ManualResetEventSlim(false);
        subscriber.StartAsync((PubsubMessage message, CancellationToken cancel) =>
        {
            if (message.Attributes["DlpJobName"] == submittedJob.Name)
            {
                Thread.Sleep(500); // Wait for DLP API results to become consistent
                done.Set();
                return Task.FromResult(SubscriberClient.Reply.Ack);
            }
            else
            {
                return Task.FromResult(SubscriberClient.Reply.Nack);
            }
        });

        done.Wait(TimeSpan.FromMinutes(10)); // 10 minute timeout; may not work for large jobs
        subscriber.StopAsync(CancellationToken.None).Wait();

        // Process results
        var resultJob = dlp.GetDlpJob(new GetDlpJobRequest
        {
            DlpJobName = DlpJobName.Parse(submittedJob.Name)
        });

        var result = resultJob.RiskDetails.KMapEstimationResult;

        for (var histogramIdx = 0; histogramIdx < result.KMapEstimationHistogram.Count; histogramIdx++)
        {
            var histogramValue = result.KMapEstimationHistogram[histogramIdx];
            Console.WriteLine($"Bucket {histogramIdx}");
            Console.WriteLine($"  Anonymity range: [{histogramValue.MinAnonymity}, {histogramValue.MaxAnonymity}].");
            Console.WriteLine($"  Size: {histogramValue.BucketSize}");

            foreach (var datapoint in histogramValue.BucketValues)
            {
                // 'UnpackValue(x)' is a prettier version of 'x.toString()'
                Console.WriteLine($"    Values: [{String.Join(',', datapoint.QuasiIdsValues.Select(x => UnpackValue(x)))}]");
                Console.WriteLine($"    Estimated k-map anonymity: {datapoint.EstimatedAnonymity}");
            }
        }

        return 0;
    }

    public static string UnpackValue(Value protoValue)
    {
        var jsonValue = JsonConvert.DeserializeObject<Dictionary<string, object>>(protoValue.ToString());
        return jsonValue.Values.ElementAt(0).ToString();
    }
}

Melihat hasil tugas k-map

Untuk mengambil hasil tugas analisis risiko peta k menggunakan REST API, kirim permintaan GET berikut ke resource projects.dlpJobs. Ganti PROJECT_ID dengan project ID Anda dan JOB_ID dengan ID tugas yang ingin Anda dapatkan hasilnya. ID pekerjaan ditampilkan saat Anda memulai pekerjaan, dan juga dapat diambil dengan mencantumkan semua pekerjaan.

GET https://dlp.googleapis.com/v2/projects/PROJECT_ID/dlpJobs/JOB_ID

Permintaan ini menampilkan objek JSON yang berisi instance tugas. Hasil analisis berada di dalam kunci "riskDetails", dalam objek AnalyzeDataSourceRiskDetails. Untuk mengetahui informasi selengkapnya, lihat referensi API untuk resource DlpJob.

Langkah berikutnya

  • Pelajari cara menghitung nilai k-anonymity untuk set data.
  • Pelajari cara menghitung nilai l-diversity untuk set data.
  • Pelajari cara menghitung nilai δ-presence untuk set data.