The term control character is identified in base64 scheme by the sequence Y29udHJvbCBjaGFyYWN0ZXI=, while the MD5 signature is equal to fe1081e612a6a0ce7a406aab5e79e2f9. The ASCII encoding of control character in hexadecimal notation is 636f6e74726f6c20636861726163746572.