diff --git a/Projects/Platform/Keychain/Sources/KeychainError.swift b/Projects/Platform/Keychain/Sources/KeychainError.swift
index a3ceb82..c470cef 100644
--- a/Projects/Platform/Keychain/Sources/KeychainError.swift
+++ b/Projects/Platform/Keychain/Sources/KeychainError.swift
@@ -11,6 +11,7 @@ public enum KeychainError: Error {
   case itemNotFound
   case duplicateItem
   case invalidData
+  case unexpectedPasswordData
   case unexpected(OSStatus)
 }
 
@@ -23,6 +24,8 @@ extension KeychainError: LocalizedError {
       return "이미 존재하는 아이템입니다."
     case .invalidData:
       return "유효하지 않은 데이터입니다."
+    case .unexpectedPasswordData:
+          return "암호화된 데이터를 얻기 위해 예상치 못한 오류가 발생했습니다."
     case .unexpected(let status):
       return "Keychain 에러: \(status)"
     }