A nice Crypto tool link:

http://jya.com/crypto-free.htm

foodog wrote:
> 
> This might be a good time to get the RC4 algorithm wedged into your
> brain.  It's a far cry from PGP (it relies on a secret key), but it's a
> nice programming exercise: http://ciphersaber.gurus.com/
> 
> from the page:
> > CipherSaber-1 uses Ron Rivest's RC4 algorithm as published in the second edition of Bruce Schneier's Applied Cryptography. RC4 is widely respected and used in a
> > number of products, including SSL, the tool Web browsers use to secure credit card forms. With a long enough key RC4 is considered strong by most experts. RC4 is also
> > extraordinarily easy to explain and to reproduce. As Schneier says, "The algorithm is so simple that most programmers can quickly code it from memory." Implementations
> > of RC4 are widely available on the Internet but it is actually easier to write your own version.
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