The term arithmetic operation is identified in base64 scheme by the sequence YXJpdGhtZXRpYyBvcGVyYXRpb24=, while the MD5 signature is equal to c3d1d48cc4d5fbe2b0e2b0bf3f053606. The ASCII encoding of arithmetic operation in hexadecimal notation is 61726974686d65746963206f7065726174696f6e.