Re: Wavelets and Encryption

jsavard_at_ecn.ab.ca
Date: 05/05/03 

Date: Mon, 05 May 2003 14:21:01 GMT

David Wagner (daw@mozart.cs.berkeley.edu) wrote:
: John Bailey wrote:
: >Apparently the other posters do not consider spread spectrum
: >technology as cryptography. When cryptographically secure random
: >number generation is used to create the modulation, spread spectrum is
: >transformed from a convenient technology for cordless phones to a
: >means for secure radio transmission.

: Ok. And how do wavelets enter in?

: I did your suggested Google search, and couldn't figure
: it out on my own. Would you be willing to summarize or elaborate?

Well, I think they enter in like this:

In the book "Numerical Recipies", it is noted that wavelets are a superior
alternative (but closely related) to the DCT for image compression.

And in books on robust steganography in images, the use of spread spectrum
techniques in the concealment of data is noted as involving Fourier
transforms... or the DCT. So a wavelet transform could certainly be used
instead, it would seem to me.

I don't, however, claim to be an expert on this sort of thing.

John Savard

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