diff --git a/src/main/java/com/project/notification/controller/dto/response/MessageLogDetailResponse.java b/src/main/java/com/project/notification/controller/dto/response/MessageLogDetailResponse.java
index 619a0ee..0bd5b51 100644
--- a/src/main/java/com/project/notification/controller/dto/response/MessageLogDetailResponse.java
+++ b/src/main/java/com/project/notification/controller/dto/response/MessageLogDetailResponse.java
@@ -25,6 +25,10 @@ public record TemplateSnapshot(
             String groupId, String groupName, Channel channel, int version) {}
 
     public static MessageLogDetailResponse from(MessageLog log) {
+        return from(log, log.getRecipientEnc());
+    }
+
+    public static MessageLogDetailResponse from(MessageLog log, String recipientMasked) {
         // 템플릿 정보가 있을 경우에만 Snapshot 생성
         TemplateSnapshot snapshot = null;
         TemplateVersion templateVersion = log.getTemplateVersion();
@@ -42,7 +46,7 @@ public static MessageLogDetailResponse from(MessageLog log) {
                 log.getId(),
                 log.getTraceId(),
                 log.getSubscription().getSubId(),
-                log.getRecipientEnc(),
+                recipientMasked,
                 (templateVersion != null) ? templateVersion.getId() : null,
                 log.getChannel(),
                 log.getStatus(),
diff --git a/src/main/java/com/project/notification/service/MessageLogService.java b/src/main/java/com/project/notification/service/MessageLogService.java
index 578e7ed..81ebb24 100644
--- a/src/main/java/com/project/notification/service/MessageLogService.java
+++ b/src/main/java/com/project/notification/service/MessageLogService.java
@@ -5,8 +5,11 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import com.project.core.controller.dto.response.MaskingUtil;
 import com.project.global.exception.ApplicationException;
 import com.project.global.exception.code.domain.core.CoreErrorCode;
+import com.project.global.exception.core.OperationFailedException;
+import com.project.global.util.AesUtil;
 import com.project.notification.controller.dto.request.MessageLogSearchRequest;
 import com.project.notification.controller.dto.response.MessageLogDetailResponse;
 import com.project.notification.controller.dto.response.MessageLogResponse;
@@ -14,13 +17,16 @@
 import com.project.notification.infra.repository.MessageLogRepository;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 @Service
 @RequiredArgsConstructor
 @Transactional(readOnly = true)
+@Slf4j
 public class MessageLogService {
 
     private final MessageLogRepository messageLogRepository;
+    private final AesUtil aesUtil;
 
     /** 로그 목록 검색 */
     public Slice<MessageLogResponse> searchLogs(
@@ -35,6 +41,31 @@ public MessageLogDetailResponse getLogDetail(Long logId) {
                         .findDetailById(logId)
                         .orElseThrow(() -> new ApplicationException(CoreErrorCode.LOG_NOT_FOUND));
 
-        return MessageLogDetailResponse.from(log);
+        String decryptedRecipient = safeDecrypt(log.getRecipientEnc());
+        String maskedRecipient = maskRecipient(decryptedRecipient);
+
+        return MessageLogDetailResponse.from(log, maskedRecipient);
+    }
+
+    private String safeDecrypt(String encrypted) {
+        if (encrypted == null) {
+            return null;
+        }
+        try {
+            return aesUtil.decrypt(encrypted);
+        } catch (OperationFailedException e) {
+            log.warn("Failed to decrypt recipient. value: {}", encrypted, e);
+            return encrypted;
+        }
+    }
+
+    private String maskRecipient(String recipient) {
+        if (recipient == null || recipient.isBlank()) {
+            return recipient;
+        }
+        if (recipient.contains("@")) {
+            return MaskingUtil.maskEmail(recipient);
+        }
+        return MaskingUtil.maskPhone(recipient);
     }
 }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 7be2722..29bdc1a 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -85,4 +85,8 @@ logging:
     org.springframework.web: INFO
     org.hibernate.SQL: WARN
   pattern:
-    level: "%5p [${spring.application.name:},%X{traceId:-},%X{spanId:-}]"
\ No newline at end of file
+    level: "%5p [${spring.application.name:},%X{traceId:-},%X{spanId:-}]"
+
+debug:
+  crypto:
+    enabled: true