The term undistinguishable is identified in base64 scheme by the sequence dW5kaXN0aW5ndWlzaGFibGU=, while the MD5 signature is equal to 597fcbf6120b20cb9b7daec7e9cd0c09. The ASCII encoding of undistinguishable in hexadecimal notation is 756e64697374696e677569736861626c65.