Re: Basic tools of encryption: Transposition and substitution?
- From: jsavard@xxxxxxxxxxxxxxxxxxxxxxxxxx (John Savard)
- Date: Sat, 31 Dec 2005 20:05:29 GMT
On Sat, 31 Dec 2005 13:42:30 +0800, Doug <doug@xxxxxxxx> wrote, in part:
>the basic tools of encryption
>were always Transposition and Substitution.
You might want to look at my web site, at
http://www.quadibloc.com/crypto/mi0615.htm
where I look at the basic tools.
Compression, in itself, is just a form of substitution. It is a useful
form of preprocessing before encryption, as it removes redundancy,
useful to cryptographers when attacking without known plaintext. But
modern ciphers are expected to be secure against known-plaintext
attacks, and thus the importance of compression has diminished.
John Savard
http://www.quadibloc.com/index.html
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