diff --git a/.gitignore b/.gitignore
index 357e835..ecd81b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # 환경/비밀 — 절대 commit 금지
 .env
+.runtime/
 .env.*
 !.env.example
 
diff --git a/database/adb/47_dds_ad_identity_test_setup.sql b/database/adb/47_dds_ad_identity_test_setup.sql
new file mode 100644
index 0000000..58b41f1
--- /dev/null
+++ b/database/adb/47_dds_ad_identity_test_setup.sql
@@ -0,0 +1,159 @@
+-- ============================================================
+-- 47_dds_ad_identity_test_setup.sql
+--
+-- Test-only bridge for the isolated dds.test Active Directory domain.
+-- Maps immutable AD objectGUID values to the existing HMM application users
+-- 1 and 2, then publishes only their passwordless local DDS END USERs.
+--
+-- This does NOT validate an AD/OIDC JWT. A verified issuer + subject must be
+-- resolved by the MCP application before it uses this bridge.
+-- ============================================================
+WHENEVER SQLERROR EXIT SQL.SQLCODE
+SET ECHO OFF
+SET FEEDBACK ON
+SET DEFINE OFF
+
+PROMPT === 1. Creating external identity bridge ===
+BEGIN
+  EXECUTE IMMEDIATE q'[
+    CREATE TABLE cb_external_identity_binding (
+      issuer                 VARCHAR2(512) NOT NULL,
+      subject                VARCHAR2(512) NOT NULL,
+      application_user_id    NUMBER NOT NULL,
+      display_name            VARCHAR2(256),
+      active                 CHAR(1) DEFAULT 'Y' NOT NULL
+        CHECK (active IN ('Y', 'N')),
+      created_at             TIMESTAMP DEFAULT SYSTIMESTAMP NOT NULL,
+      updated_at             TIMESTAMP DEFAULT SYSTIMESTAMP NOT NULL,
+      CONSTRAINT cb_external_identity_binding_pk PRIMARY KEY (issuer, subject)
+    )]';
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE <> -955 THEN RAISE; END IF;
+END;
+/
+
+BEGIN
+  EXECUTE IMMEDIATE 'CREATE INDEX cb_external_identity_binding_user_ix '
+    || 'ON cb_external_identity_binding (application_user_id)';
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE <> -955 THEN RAISE; END IF;
+END;
+/
+
+PROMPT === 2. Creating DDS END USER map ===
+BEGIN
+  EXECUTE IMMEDIATE q'[
+    CREATE TABLE cb_dds_end_user_map (
+      application_user_id NUMBER PRIMARY KEY,
+      end_user_name       VARCHAR2(128) NOT NULL UNIQUE,
+      data_role_name      VARCHAR2(128) NOT NULL UNIQUE,
+      lookup_key_ref      VARCHAR2(128) NOT NULL,
+      grant_name          VARCHAR2(128) NOT NULL,
+      publish_status      VARCHAR2(20) NOT NULL
+        CHECK (publish_status IN ('PENDING', 'PUBLISHED', 'REVOKED', 'FAILED')),
+      published_at        TIMESTAMP,
+      last_error          VARCHAR2(1000)
+    )]';
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE <> -955 THEN RAISE; END IF;
+END;
+/
+
+DECLARE
+  v_active_users NUMBER;
+BEGIN
+  SELECT COUNT(*) INTO v_active_users
+  FROM cb_app_user
+  WHERE user_id IN (1, 2) AND active = 'Y';
+  IF v_active_users <> 2 THEN
+    RAISE_APPLICATION_ERROR(-20947, 'Expected active HMM application users 1 and 2.');
+  END IF;
+END;
+/
+
+PROMPT === 3. Binding dds.test immutable subjects to HMM users ===
+MERGE INTO cb_external_identity_binding target
+USING (
+  SELECT 'urn:dds-ad:test' AS issuer,
+         'fa7ebe4b-aca8-4049-a436-7f3da2d27a9f' AS subject,
+         1 AS application_user_id,
+         'dds-alice' AS display_name
+  FROM dual
+  UNION ALL
+  SELECT 'urn:dds-ad:test',
+         '128546cf-ec0a-4e99-8f51-dfce29280c91',
+         2,
+         'dds-bob'
+  FROM dual
+) source
+ON (target.issuer = source.issuer AND target.subject = source.subject)
+WHEN MATCHED THEN UPDATE SET
+  target.application_user_id = source.application_user_id,
+  target.display_name = source.display_name,
+  target.active = 'Y',
+  target.updated_at = SYSTIMESTAMP
+WHEN NOT MATCHED THEN INSERT (
+  issuer, subject, application_user_id, display_name, active
+) VALUES (
+  source.issuer, source.subject, source.application_user_id, source.display_name, 'Y'
+);
+
+MERGE INTO cb_dds_end_user_map target
+USING (
+  SELECT user_id AS application_user_id,
+         'DDS_U_' || TO_CHAR(user_id) AS end_user_name,
+         'DDS_U_' || TO_CHAR(user_id) || '_ROLE' AS data_role_name,
+         'DDS_OCI_IAM_CLIENT_SECRET_DERIVED_V1' AS lookup_key_ref,
+         'DDS_MCP_U_' || TO_CHAR(user_id) || '_VECTOR_GRANT' AS grant_name
+  FROM cb_app_user
+  WHERE user_id IN (1, 2)
+) source
+ON (target.application_user_id = source.application_user_id)
+WHEN MATCHED THEN UPDATE SET
+  target.end_user_name = source.end_user_name,
+  target.data_role_name = source.data_role_name,
+  target.lookup_key_ref = source.lookup_key_ref,
+  target.grant_name = source.grant_name,
+  target.publish_status = 'PENDING',
+  target.last_error = NULL
+WHEN NOT MATCHED THEN INSERT (
+  application_user_id, end_user_name, data_role_name, lookup_key_ref,
+  grant_name, publish_status
+) VALUES (
+  source.application_user_id, source.end_user_name, source.data_role_name,
+  source.lookup_key_ref, source.grant_name, 'PENDING'
+);
+
+PROMPT === 4. Publishing DDS identities only (default deny until data grants exist) ===
+BEGIN
+  FOR mapped_user IN (
+    SELECT application_user_id, end_user_name, data_role_name
+    FROM cb_dds_end_user_map
+    WHERE application_user_id IN (1, 2)
+    ORDER BY application_user_id
+  ) LOOP
+    EXECUTE IMMEDIATE 'CREATE END USER IF NOT EXISTS "' || mapped_user.end_user_name || '"';
+    EXECUTE IMMEDIATE 'CREATE DATA ROLE IF NOT EXISTS ' || mapped_user.data_role_name;
+    EXECUTE IMMEDIATE 'GRANT DATA ROLE ' || mapped_user.data_role_name
+      || ' TO "' || mapped_user.end_user_name || '"';
+    UPDATE cb_dds_end_user_map
+    SET publish_status = 'PUBLISHED', published_at = SYSTIMESTAMP, last_error = NULL
+    WHERE application_user_id = mapped_user.application_user_id;
+  END LOOP;
+  COMMIT;
+END;
+/
+
+PROMPT === 5. Identity bridge inventory ===
+SELECT b.issuer, b.subject, b.display_name, b.application_user_id,
+       m.end_user_name, m.data_role_name, m.publish_status
+FROM cb_external_identity_binding b
+JOIN cb_dds_end_user_map m ON m.application_user_id = b.application_user_id
+WHERE b.issuer = 'urn:dds-ad:test'
+ORDER BY b.application_user_id;
+
+PROMPT === AD identity to DDS END USER test setup complete ===
+EXIT;
diff --git a/dds-backoffice/pom.xml b/dds-backoffice/pom.xml
index 4b05413..0fa8262 100644
--- a/dds-backoffice/pom.xml
+++ b/dds-backoffice/pom.xml
@@ -42,6 +42,10 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-security</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.springframework.security</groupId>
+      <artifactId>spring-security-oauth2-jose</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.oracle.database.jdbc</groupId>
       <artifactId>ojdbc11</artifactId>
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/DdsBackofficeApplication.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/DdsBackofficeApplication.java
index 651b039..5873be9 100644
--- a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/DdsBackofficeApplication.java
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/DdsBackofficeApplication.java
@@ -2,6 +2,7 @@ package com.cloudhandson.ddsbackoffice;
 
 import com.cloudhandson.ddsbackoffice.config.DdsProperties;
 import com.cloudhandson.ddsbackoffice.config.DdsMcpIamProperties;
+import com.cloudhandson.ddsbackoffice.config.DdsMcpOidcProperties;
 import com.cloudhandson.vpdbackoffice.VpdBackofficeApplication;
 import com.cloudhandson.vpdbackoffice.web.DashboardController;
 import com.cloudhandson.vpdbackoffice.web.LoginController;
@@ -15,7 +16,7 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.FilterType;
 
 @SpringBootApplication
-@EnableConfigurationProperties({DdsProperties.class, DdsMcpIamProperties.class})
+@EnableConfigurationProperties({DdsProperties.class, DdsMcpIamProperties.class, DdsMcpOidcProperties.class})
 @MapperScan("com.cloudhandson.vpdbackoffice.mapper")
 @ComponentScan(
     basePackages = {"com.cloudhandson.ddsbackoffice", "com.cloudhandson.vpdbackoffice"},
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcConfiguration.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcConfiguration.java
new file mode 100644
index 0000000..77867f7
--- /dev/null
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcConfiguration.java
@@ -0,0 +1,29 @@
+package com.cloudhandson.ddsbackoffice.config;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.oauth2.core.OAuth2Error;
+import org.springframework.security.oauth2.core.DelegatingOAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtDecoder;
+import org.springframework.security.oauth2.jwt.JwtValidators;
+import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
+
+@Configuration
+@ConditionalOnProperty(prefix = "dds.mcp.oidc", name = "enabled", havingValue = "true")
+public class DdsMcpOidcConfiguration {
+
+  @Bean
+  JwtDecoder ddsMcpJwtDecoder(DdsMcpOidcProperties properties) {
+    NimbusJwtDecoder decoder = NimbusJwtDecoder.withIssuerLocation(properties.issuerUri()).build();
+    OAuth2TokenValidator<Jwt> audienceValidator = jwt -> jwt.getAudience().contains(properties.audience())
+        ? OAuth2TokenValidatorResult.success()
+        : OAuth2TokenValidatorResult.failure(new OAuth2Error("invalid_token", "Invalid audience", null));
+    decoder.setJwtValidator(new DelegatingOAuth2TokenValidator<>(
+        JwtValidators.createDefaultWithIssuer(properties.issuerUri()), audienceValidator));
+    return decoder;
+  }
+}
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcProperties.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcProperties.java
new file mode 100644
index 0000000..afcc425
--- /dev/null
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/config/DdsMcpOidcProperties.java
@@ -0,0 +1,22 @@
+package com.cloudhandson.ddsbackoffice.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.bind.ConstructorBinding;
+
+/** OIDC resource-server settings for externally authenticated MCP callers. */
+@ConfigurationProperties(prefix = "dds.mcp.oidc")
+public record DdsMcpOidcProperties(boolean enabled, String issuerUri, String audience) {
+
+  @ConstructorBinding
+  public DdsMcpOidcProperties {
+    issuerUri = trim(issuerUri);
+    audience = trim(audience);
+    if (enabled && (issuerUri.isBlank() || audience.isBlank())) {
+      throw new IllegalArgumentException("DDS MCP OIDC issuer-uri와 audience를 설정해야 합니다.");
+    }
+  }
+
+  private static String trim(String value) {
+    return value == null ? "" : value.trim();
+  }
+}
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListener.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListener.java
index 5667d78..ce4cde4 100644
--- a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListener.java
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListener.java
@@ -1,6 +1,6 @@
 package com.cloudhandson.ddsbackoffice.service;
 
-import com.cloudhandson.vpdbackoffice.service.DdsAuthorizationSynchronizer;
+import com.cloudhandson.vpdbackoffice.service.ExternalAuthorizationSynchronizer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.dao.DataAccessResourceFailureException;
@@ -8,7 +8,7 @@ import org.springframework.stereotype.Component;
 
 /** Republishes all local DDS MCP identities in the same request as an authorization change. */
 @Component
-public class DdsMcpAuthorizationChangeListener implements DdsAuthorizationSynchronizer {
+public class DdsMcpAuthorizationChangeListener implements ExternalAuthorizationSynchronizer {
 
   private static final Logger log = LoggerFactory.getLogger(DdsMcpAuthorizationChangeListener.class);
   private final DdsMcpEndUserPublisher publisher;
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpBearerAuthenticator.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpBearerAuthenticator.java
index 28b15b4..ce5a97d 100644
--- a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpBearerAuthenticator.java
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpBearerAuthenticator.java
@@ -9,6 +9,7 @@ import com.cloudhandson.vpdbackoffice.service.BearerTokenService;
 import java.time.Clock;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.stereotype.Service;
 
 /** Revalidates the MCP request bearer before every tool invocation. */
@@ -20,22 +21,32 @@ public class DdsMcpBearerAuthenticator {
   private final BearerTokenService bearerTokenService;
   private final UserMapper userMapper;
   private final DdsMcpEndUserResolver endUserResolver;
+  private final ObjectProvider<DdsMcpOidcAuthenticator> oidcAuthenticator;
   private final Clock clock;
 
   public DdsMcpBearerAuthenticator(
       BearerTokenService bearerTokenService,
       UserMapper userMapper,
       DdsMcpEndUserResolver endUserResolver,
+      ObjectProvider<DdsMcpOidcAuthenticator> oidcAuthenticator,
       Clock clock
   ) {
     this.bearerTokenService = bearerTokenService;
     this.userMapper = userMapper;
     this.endUserResolver = endUserResolver;
+    this.oidcAuthenticator = oidcAuthenticator;
     this.clock = clock;
   }
 
   public DdsMcpAuthenticatedUser authenticate(String authorization) {
     String plainToken = bearerValue(authorization);
+    if (plainToken.chars().filter(character -> character == '.').count() == 2) {
+      DdsMcpOidcAuthenticator oidc = oidcAuthenticator.getIfAvailable();
+      if (oidc == null) {
+        throw denied();
+      }
+      return oidc.authenticate(plainToken);
+    }
     BearerTokenRecord token = bearerTokenService.findByPlainToken(plainToken);
     LocalDateTime now = LocalDateTime.now(clock.withZone(ZoneId.systemDefault()));
     if (token == null || !token.active(now) || !bearerTokenService.matches(token, plainToken)) {
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpExternalIdentityResolver.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpExternalIdentityResolver.java
new file mode 100644
index 0000000..16cf829
--- /dev/null
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpExternalIdentityResolver.java
@@ -0,0 +1,51 @@
+package com.cloudhandson.ddsbackoffice.service;
+
+import com.cloudhandson.vpdbackoffice.service.AppException;
+import java.util.List;
+import org.springframework.dao.DataAccessException;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Service;
+
+/** Maps a verified OIDC issuer and subject to one active HMM application user. */
+@Service
+public class DdsMcpExternalIdentityResolver {
+
+  private final JdbcTemplate jdbcTemplate;
+
+  public DdsMcpExternalIdentityResolver(JdbcTemplate jdbcTemplate) {
+    this.jdbcTemplate = jdbcTemplate;
+  }
+
+  public long resolveApplicationUserId(String issuer, String subject) {
+    if (!safe(issuer) || !safe(subject)) {
+      throw denied();
+    }
+    try {
+      List<Long> userIds = jdbcTemplate.query("""
+          SELECT b.application_user_id
+          FROM cb_external_identity_binding b
+          JOIN cb_app_user u ON u.user_id = b.application_user_id
+          WHERE b.issuer = ?
+            AND b.subject = ?
+            AND b.active = 'Y'
+            AND u.active = 'Y'
+          """, (row, ignored) -> row.getLong("application_user_id"), issuer, subject);
+      if (userIds.size() != 1) {
+        throw denied();
+      }
+      return userIds.getFirst();
+    } catch (AppException exception) {
+      throw exception;
+    } catch (DataAccessException exception) {
+      throw new AppException("DDS_CONTEXT_UNAVAILABLE: 외부 ID 매핑을 확인할 수 없습니다.");
+    }
+  }
+
+  private boolean safe(String value) {
+    return value != null && !value.isBlank() && value.length() <= 512;
+  }
+
+  private AppException denied() {
+    return new AppException("AUTHORIZATION_DENIED: 외부 OIDC 사용자를 DDS에 매핑할 수 없습니다.");
+  }
+}
diff --git a/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpOidcAuthenticator.java b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpOidcAuthenticator.java
new file mode 100644
index 0000000..5f497a6
--- /dev/null
+++ b/dds-backoffice/src/main/java/com/cloudhandson/ddsbackoffice/service/DdsMcpOidcAuthenticator.java
@@ -0,0 +1,55 @@
+package com.cloudhandson.ddsbackoffice.service;
+
+import com.cloudhandson.ddsbackoffice.domain.DdsMcpAuthenticatedUser;
+import com.cloudhandson.vpdbackoffice.domain.user.AppUser;
+import com.cloudhandson.vpdbackoffice.mapper.UserMapper;
+import com.cloudhandson.vpdbackoffice.service.AppException;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtDecoder;
+import org.springframework.security.oauth2.jwt.JwtException;
+import org.springframework.stereotype.Service;
+
+/** Validates a signed OIDC JWT before looking up the DDS identity bridge. */
+@Service
+@ConditionalOnProperty(prefix = "dds.mcp.oidc", name = "enabled", havingValue = "true")
+public class DdsMcpOidcAuthenticator {
+
+  private final JwtDecoder jwtDecoder;
+  private final DdsMcpExternalIdentityResolver externalIdentityResolver;
+  private final UserMapper userMapper;
+  private final DdsMcpEndUserResolver endUserResolver;
+
+  public DdsMcpOidcAuthenticator(
+      JwtDecoder jwtDecoder,
+      DdsMcpExternalIdentityResolver externalIdentityResolver,
+      UserMapper userMapper,
+      DdsMcpEndUserResolver endUserResolver
+  ) {
+    this.jwtDecoder = jwtDecoder;
+    this.externalIdentityResolver = externalIdentityResolver;
+    this.userMapper = userMapper;
+    this.endUserResolver = endUserResolver;
+  }
+
+  public DdsMcpAuthenticatedUser authenticate(String token) {
+    try {
+      Jwt jwt = jwtDecoder.decode(token);
+      long userId = externalIdentityResolver.resolveApplicationUserId(
+          jwt.getIssuer() == null ? null : jwt.getIssuer().toString(), jwt.getSubject());
+      AppUser user = userMapper.findById(userId);
+      if (user == null || !user.active()) {
+        throw denied();
+      }
+      return new DdsMcpAuthenticatedUser(user.userId(), user.username(), endUserResolver.resolve(user.userId()));
+    } catch (AppException exception) {
+      throw exception;
+    } catch (JwtException | IllegalArgumentException exception) {
+      throw denied();
+    }
+  }
+
+  private AppException denied() {
+    return new AppException("AUTHORIZATION_DENIED: MCP OIDC 토큰을 확인할 수 없습니다.");
+  }
+}
diff --git a/dds-backoffice/src/main/resources/application.yml b/dds-backoffice/src/main/resources/application.yml
index 10eed9e..b9bcb6c 100644
--- a/dds-backoffice/src/main/resources/application.yml
+++ b/dds-backoffice/src/main/resources/application.yml
@@ -58,6 +58,12 @@ backoffice:
 dds:
   mcp:
     permission-sync-enabled: true
+    oidc:
+      # Disabled unless an external OIDC issuer is explicitly configured.
+      # The production issuer must use HTTPS; the isolated AD VM uses a temporary HTTP value only for PoC.
+      enabled: ${DDS_MCP_OIDC_ENABLED:false}
+      issuer-uri: ${DDS_MCP_OIDC_ISSUER_URI:}
+      audience: ${DDS_MCP_OIDC_AUDIENCE:dds-mcp}
     iam:
       domain-url: ${DDS_OCI_IAM_DOMAIN_URL:}
       token-uri: ${DDS_OCI_IAM_TOKEN_URI:}
diff --git a/dds-backoffice/src/test/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListenerTest.java b/dds-backoffice/src/test/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListenerTest.java
index a952fd6..2d4c39e 100644
--- a/dds-backoffice/src/test/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListenerTest.java
+++ b/dds-backoffice/src/test/java/com/cloudhandson/ddsbackoffice/service/DdsMcpAuthorizationChangeListenerTest.java
@@ -3,8 +3,8 @@ package com.cloudhandson.ddsbackoffice.service;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import com.cloudhandson.vpdbackoffice.service.DdsAuthorizationChangeNotifier;
-import com.cloudhandson.vpdbackoffice.service.DdsAuthorizationSynchronizer;
+import com.cloudhandson.vpdbackoffice.service.ExternalAuthorizationChangeNotifier;
+import com.cloudhandson.vpdbackoffice.service.ExternalAuthorizationSynchronizer;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 
@@ -16,9 +16,9 @@ class DdsMcpAuthorizationChangeListenerTest {
     when(publisher.publish()).thenReturn(new com.cloudhandson.ddsbackoffice.domain.DdsMcpEndUserPublishResult(3, 0, 0));
     DdsMcpAuthorizationChangeListener listener = new DdsMcpAuthorizationChangeListener(publisher);
     DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
-    factory.registerSingleton("ddsSynchronizer", (DdsAuthorizationSynchronizer) listener);
+    factory.registerSingleton("ddsSynchronizer", (ExternalAuthorizationSynchronizer) listener);
 
-    new DdsAuthorizationChangeNotifier(factory.getBeanProvider(DdsAuthorizationSynchronizer.class))
+    new ExternalAuthorizationChangeNotifier(factory.getBeanProvider(ExternalAuthorizationSynchronizer.class))
         .changed("PERMISSION_SAVED");
 
     verify(publisher).publish();
diff --git a/docs/design/744-windows-ad-dds-end-user-mapping/README.md b/docs/design/744-windows-ad-dds-end-user-mapping/README.md
new file mode 100644
index 0000000..a9a39b5
--- /dev/null
+++ b/docs/design/744-windows-ad-dds-end-user-mapping/README.md
@@ -0,0 +1,81 @@
+# 설계서: Windows AD 기반 DDS END USER 매핑 테스트 (#744)
+
+> **상태**: OIDC JWT → MCP 매핑 검증 완료 · DDS data grant 검증 대기  
+> **최종수정**: 2026-08-04  
+> **추적성**: Redmine #744 · 선행 설계: [DDS MCP END USER Context](../617-dds-mcp-end-user-context/README.md)
+
+## 1. 목적과 범위
+
+Microsoft Entra ID 테넌트가 아직 준비되지 않은 상황에서, OCI 격리 네트워크의 Windows Server AD DS를 이용해 업무 사용자 디렉터리와 DDS END USER 매핑을 먼저 검증한다.
+
+이 환경은 **Microsoft Entra access token을 Oracle DB가 직접 검증하는 환경이 아니다.** AD DS는 사용자·그룹·UPN을 제공하고, 이후 Keycloak 또는 별도 검증 서비스가 AD LDAP을 기반으로 발급·검증한 토큰의 안정적인 subject를 MCP의 업무 사용자로 해석한다. Entra tenant와 app registration이 준비되면 OIDC issuer/audience/JWKS 검증 경로로 교체 또는 병행한다.
+
+## 2. 격리 인프라
+
+| 항목 | 구성 |
+|---|---|
+| 네트워크 | `handson-vcn`의 전용 `10.0.2.0/28` public subnet |
+| Windows VM | `hmm-ad-dss-test-isolated`, Windows Server 2022, 2 OCPU / 16 GB |
+| 관리 접근 | RDP TCP/3389은 작업자 공인 IP 한 곳에만 NSG로 허용 |
+| OIDC HTTPS | `https://ad.cloud-handson.com` (Caddy TLS reverse proxy → Keycloak) |
+| 서브넷 보안 목록 | 인바운드 전부 차단, Windows Update 및 테스트용 아웃바운드만 허용 |
+| 도메인 | `dds.test` (AD DS forest/domain) |
+
+이 VM은 테스트 전용이다. 기존 공유 public subnet의 NAT 경로를 변경하지 않으며, 비용 발생 리소스이므로 검증 종료 뒤 중지 또는 삭제를 결정한다.
+
+## 3. 식별자와 권한 흐름
+
+```text
+AD 사용자 (UPN: alice@dds.test, objectGUID)
+          │ LDAP / OIDC bridge
+          ▼
+검증된 Bearer claims
+  iss, aud, exp, sub = 불변 외부 subject
+          │ MCP bearer authenticator
+          ▼
+CB_EXTERNAL_IDENTITY_BINDING
+  issuer + subject -> CB_APP_USER.user_id
+          ▼
+CB_DDS_END_USER_MAP
+  user_id -> DDS_U_<user_id> local END USER
+          ▼
+ORA_END_USER_CONTEXT + DDS DATA GRANT / 권한 함수
+```
+
+`sub`는 Keycloak이 발급하는 안정적인 federated-user 식별자다. AD objectGUID는 원천 디렉터리의 감사 식별자로 유지하되, 실제 권한 키는 **검증된 JWT의 `iss + sub`**로 고정한다. UPN은 로그인 화면·감사 표시용으로 보관할 수 있지만 권한 키로 신뢰하지 않는다. `iss + sub` 조합이 유일하지 않거나, 매핑이 없거나, 사용자가 비활성이면 요청은 fail-closed로 거부한다.
+
+## 4. 구현 단계
+
+1. Windows Server에 AD DS를 설치하고 `dds.test` forest를 생성한다.
+2. 테스트 사용자 `dds-alice`, `dds-bob`와 권한 그룹을 만들고, LDAP 조회와 인증을 확인한다.
+3. AD LDAP과 연동한 OIDC bridge(예: Keycloak)를 별도 서비스로 구성한다. bridge가 내는 JWT의 `iss`, `aud`, `exp`, JWKS 서명을 MCP가 검증한다.
+4. `issuer + sub`에서 `CB_APP_USER` 및 `CB_DDS_END_USER_MAP`을 해석하도록 백오피스/DB 매핑을 추가한다.
+5. alice/bob의 서로 다른 `DDS_U_*` context에서 동일 MCP tool 호출 결과가 권한에 따라 달라지는지 검증한다.
+6. 매핑 누락, 만료 토큰, 다른 issuer/audience, 비활성 계정은 모두 거부되는 regression을 추가한다.
+
+## 4.1 현재 테스트 bridge
+
+`database/adb/47_dds_ad_identity_test_setup.sql`은 HMM DB의 기존 업무 사용자 원천을 변경하지 않는다. 스크립트가 만든 `CB_EXTERNAL_IDENTITY_BINDING`에는 최종 OIDC issuer와 Keycloak이 실제로 발급한 subject만 보관한다.
+
+| AD 사용자 | OIDC issuer | JWT `sub` | HMM application user | DDS END USER |
+|---|---|---|---:|---|
+| `dds-alice` | `https://ad.cloud-handson.com/realms/dds-test` | `11cf09c9-4713-4145-85cd-e3397d4a2405` | 1 | `DDS_U_1` |
+| `dds-bob` | `https://ad.cloud-handson.com/realms/dds-test` | `d9610e18-a327-4dda-9496-69e5a2067460` | 2 | `DDS_U_2` |
+
+`dds-mcp` client는 access token audience에 `dds-mcp`를 포함한다. MCP는 Keycloak JWKS에서 JWT 서명과 `iss`, `aud`, 만료 시간을 검증한 뒤에만 위 매핑을 조회한다. 실제 `/dds/mcp/messages` 초기화 요청에 Alice JWT를 넣어 성공 응답을 확인했다.
+
+이 단계는 END USER와 DATA ROLE만 게시한다. 각 DATA ROLE에는 data grant를 만들지 않았으므로 데이터 도구 호출은 여전히 **default deny**다.
+
+## 5. Entra ID로 전환할 때
+
+Entra tenant가 확보되면 AD DS/bridge 테스트에서 확인한 `issuer + immutable subject -> CB_APP_USER -> DDS END USER` 계약은 유지한다. 바뀌는 부분은 token issuer와 JWKS 검증 설정뿐이다. Entra의 claim 이름(`oid`, `sub`, `preferred_username` 등)은 실제 발급 토큰을 확인한 뒤 결정하며, `sub` 단독이 아니라 tenant/issuer 경계를 반드시 포함한다.
+
+## 6. 완료 기준
+
+- [x] `dds.test` AD forest와 두 테스트 사용자가 생성되었다.
+- [x] Keycloak LDAP bridge가 HTTPS OIDC JWT를 발급하고 각 사용자가 서로 다른 안정 subject를 가진다.
+- [x] MCP가 JWT signature/issuer/audience를 검증하고 `issuer + sub` 매핑을 해석한다.
+- [ ] subject 매핑을 통해 각 요청에 대응하는 DDS END USER context만 attach된다.
+- [ ] 서로 다른 권한의 동일 MCP 호출에서 데이터 행/열 결과가 달라진다.
+- [ ] 미매핑·만료·issuer/audience 불일치 요청은 데이터 접근 전에 거부된다.
+- [ ] 종료 시 테스트 VM과 전용 네트워크 리소스의 정리 여부 및 비용 상태를 Redmine에 기록한다.