The term concrete representation is identified in base64 scheme by the sequence Y29uY3JldGUgcmVwcmVzZW50YXRpb24=, while the MD5 signature is equal to 3183f6586661654b58773ae476767b0e. The ASCII encoding of concrete representation in hexadecimal notation is 636f6e637265746520726570726573656e746174696f6e.