message: fixed authTag value
diff: @@ -43,7 +43,7 @@ class Encryptor {
  let [ciphertext, iv, authTag] = parts;
  let authTagBuffer = Buffer.from(authTag, 'base64');
  if(authTagBuffer.length !== 16){
  - throw new Error("Not a valid signed message");
  + throw new Error("unable to authenticate data");
  }
  let decipher = crypto.createDecipheriv('aes-256-gcm', this.key, Buffer.from(iv, 'base64'));
  decipher.setAuthTag(authTagBuffer);
  