The term character reference is identified in base64 scheme by the sequence Y2hhcmFjdGVyIHJlZmVyZW5jZQ==, while the MD5 signature is equal to 1f25895324da7fc9d0b24d1330b3db1b. The ASCII encoding of character reference in hexadecimal notation is 636861726163746572207265666572656e6365.