The term impenetrableness is identified in base64 scheme by the sequence aW1wZW5ldHJhYmxlbmVzcw==, while the MD5 signature is equal to 2a63a7d0773321dd9c01670aaf9ce3e8. The ASCII encoding of impenetrableness in hexadecimal notation is 696d70656e65747261626c656e657373.