re how to detect use of an illegal cipher in article c nmb cof news claremont edu ebrandt jarthur claremont edu eli brandt writes i probably shouldn t say this but they could try to detect the use of an illegal cypher by transmitting in the clear some statistical properties of the plaintext an old fashioned wiretap could then detect the use of pre encryption which would drastically increase the measured entropy of the input a countermeasure to this would be to use steganographic techniques which put out voice this way to detect pre encryption may be defeated one can do transformation of the spectrum of encrypted signal just by adding some pre arranged in the beginning of communication function i think so say you can do fft of your encrypted signal just thinking for pgp public key finger mkagalen lynx dac northeastern edu
