The term descending colon is identified in base64 scheme by the sequence ZGVzY2VuZGluZyBjb2xvbg==, while the MD5 signature is equal to d5f269fc40740484e1f80291cfb81612. The ASCII encoding of descending colon in hexadecimal notation is 64657363656e64696e6720636f6c6f6e.