diff --git a/server/util/aes.ts b/server/util/aes.ts
index f6b1ace..340d974 100644
--- a/server/util/aes.ts
+++ b/server/util/aes.ts
@@ -8,7 +8,7 @@ type EncryptedData = {
 }
 
 
-export async function AES_GCM_Encrypt(key: ArrayBuffer, msg: ArrayBuffer): Promise<EncryptedData> {
+export async function AES_GCM_Encrypt(key: ArrayBuffer, msg: ArrayBuffer, aad?: ArrayBuffer): Promise<EncryptedData> {
     const iv = webcrypto.getRandomValues(new Uint8Array(12));
     const keyObj = await subtle.importKey("raw", key, {
         name: "AES-GCM",
@@ -16,7 +16,8 @@ export async function AES_GCM_Encrypt(key: ArrayBuffer, msg: ArrayBuffer): Promi
 
     const ciphertext = await subtle.encrypt({
         name: "AES-GCM",
-        iv
+        iv,
+        additionalData: aad
     }, keyObj, msg);
 
     return {
@@ -26,14 +27,15 @@ export async function AES_GCM_Encrypt(key: ArrayBuffer, msg: ArrayBuffer): Promi
 }
 
 
-export async function AES_GCM_Decrypt(key: ArrayBuffer, data: EncryptedData): Promise<ArrayBuffer> {
+export async function AES_GCM_Decrypt(key: ArrayBuffer, data: EncryptedData, aad?: ArrayBuffer): Promise<ArrayBuffer> {
     const keyObj = await subtle.importKey("raw", key, {
         name: "AES-GCM",
     }, false, ["decrypt"]);
 
     const plaintext = await subtle.decrypt({
         name: "AES-GCM",
-        iv: data.iv
+        iv: data.iv,
+        additionalData: aad
     }, keyObj, data.ciphertext);
     //아마도 tag 검증 실패시 예외가 발생할 것으로 예상