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Re: Hiding Encrypted Messages
Murdering Thug says:
> I think it would be quite easy to hide encrypted text in music/sound or
> graphics files.
> 1. Use a SoundBlaster-type card to sample a given amount of music from a
> radio/tape/cd/whatever using 8-bit samples at some low sampling rate
> like 11,000 samples/second. This would give you a lot of music for the
> space used.
> 2. Then take an encrypted PGP file and dispurse it bit-by-bit into the
> LSB (least-significant-bit) of each sample. This wouldn't distort the
> sound sample to any extent noticable by the human ear. Thus each byte
> of PGP file would be dispursed into 8 bytes of sound file. Thus if
> you wanted to send a 20k PGP file, you would have to put it into a
> 160k music file.
> If you're ever forced to explain what that file contains (unlikely, since
> you can always take the Fifth Ammendment) you can just play it on your
> computer and have the NSA/SS/FBI/Whatever listen to James Brown go
> "Hyeeeah... I feel good!"
a) This method has essentially the same complexity, as one-time pad,
but without it's strength.
b) If it's played and recognized - one can trace your source (a CD, a
tape of radio broadcast, whatever) and do a comparison. Then the
file containing of all the LSBs is cryptanalyzed...
I might be wrong IF those nice LSBs are too hard to track... But then
again, you're facing the need to communicate that one-time pad...
> +---------------+ +-------------------------------------------------+
> | ***** ___\!/_ * * * * |
> Murdering Thug | * __/_ /|\ * * * * * |
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> [email protected] | * | | * * * * |
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Oh yes, and I'm sure LOTS of people would join! (:-)
--
Regards,
Uri [email protected] scifi!angmar!uri N2RIU
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<Disclamer>