[cbk1994]

This provides almost no security at all. It's just a caesar cipher, and can be easily broken by either frequency analysis or analysis based on a chosen plaintext.

Your use of the term "salt" is incorrect. A salt is used to help protect against rainbow table attacks and sometimes against brute-force attacks for a hash function. Yours is not a hash function.

I also can't imagine what applications this could possibly have for Graal.