diff --git a/packages/linejs/client/clients/e2ee/index.ts b/packages/linejs/client/clients/e2ee/index.ts
index 3c498c0..4be3f36 100644
--- a/packages/linejs/client/clients/e2ee/index.ts
+++ b/packages/linejs/client/clients/e2ee/index.ts
@@ -216,7 +216,7 @@ class E2EE extends TalkClient {
 				const { keyId, keyData } = key;
 				keyIds.push(keyId);
 
-				const aesKey = this.generateSharedSecret(selfKey, keyData);
+				const aesKey = this.generateSharedSecret(selfKey, Buffer.from(keyData));
 				const aes_key = this.getSHA256Sum(Buffer.from(aesKey), "Key");
 				const aes_iv = this.xor(this.getSHA256Sum(Buffer.from(aesKey), "IV"));
 				const cipher = crypto.createCipheriv("aes-256-cbc", aes_key, aes_iv);