I suggest you check out sci.crypt, but to quote the relevant bit of discouragement from the sci.crpyt FAQ: 
  Among professionals, a common rule of thumb is that if you want to 
  design a cryptosystem, you have to have experience as a cryptanalyst
+.

[download]
This advice applies as much to modifying existing cryptosystems as it does to creating new ones. Unless you have a serious theoretical background in probability and number theory, as well as in cryptanalysis, don't bother. In this problem domain, our resident monks will be about as helpful as the well-intentioned folks from rec.glass-blowing. 
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: Encryption: RC4 enhancement? by MeowChow
in thread Encryption: RC4 enhancement? by sifukurt

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