The term frequency-response characteristic is identified in base64 scheme by the sequence ZnJlcXVlbmN5LXJlc3BvbnNlIGNoYXJhY3RlcmlzdGlj, while the MD5 signature is equal to 400867ff47819734fcaa1fcf10eec6c0. The ASCII encoding of frequency-response characteristic in hexadecimal notation is 6672657175656e63792d726573706f6e7365206368617261637465726973746963.