Eric Fogleman writes:
a) This method has essentially the same complexity, as one-time pad, but without it's strength. Insert pgp-encrypted (not plaintext) into the sound file... It's then no weaker that pgp.
Please... I said: "It's as cumbersome, as one-time pad, but without one-time pad security." Yes, it can be made as secure as PGP, but it's still less safe, than one-time pad.
Use a "windows sound system" board and record yourself talking -- No "reference source"... The codec on that board has better than two bits of noise per 16 bit word through the ADC channel...
Then you're creating a sort-of one-time pad, which you now must convey securely to your correspondent. And this system is still much less safe, than one-time pad, because of some possible regularities in the lower bits (now I admit I know very little of what such a recording would look like, so in fact it MIGHT be as safe as "real" one-time pad). Regards, Uri. ------------ <Disclaimer>