The term inverse function is identified in base64 scheme by the sequence aW52ZXJzZSBmdW5jdGlvbg==, while the MD5 signature is equal to 6fbc6a7d6fd091fb305e5c4db75c43e6. The ASCII encoding of inverse function in hexadecimal notation is 696e76657273652066756e6374696f6e.