I like your attitude, so I gave you a ++. Some people get
really touchy about their home-grown ciphers. It might be
a good idea to include a comment on your thoughts about the
cipher's strength, if you're going to be distributing it.
...a key with 20+ digits will be very difficult.
The central problem with your cipher is that there is
very little diffusion of key information, which allows
me to attack the key bytes one at a time. Adding more key
bytes only results in a linear increase in the difficulty
of attack. In a properly diffused cipher, it would increase
exponentially. Of course, more key bytes means more
diffusion required... take a look at
CAST5 or
AES sometime.
There's a lot to be learned by looking at existing ciphers,
even though they appear very confusing.
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