01-30-2003, 12:16 PM
Ohhhhhh, you mean encryption :roll:, whoops.
One of the simplest forms of encryption is simple rotation. In rot1 A->B, B->C and Z->A. Rot13 is the most common rotation because its halfway along the alphabet, its major drawback however is that it is extremely trivial to break.
You could have a look at cipher systems such as playfair, vignere, RSA(difficult, very secure), PGP, etc. Most cipher systems that are difficult to crack also involve some very complex mathmatics.
To write a simple encryption program in Qbasic you could either use a formula based method (eg rot13) on each letter or you could use a lookup table for encrypting each letter (requires that the table be transmitted to the reader of the code, but then how do you encrypt the table :???: ). Both methods should be relatively simple exercises in programming.
One of the simplest forms of encryption is simple rotation. In rot1 A->B, B->C and Z->A. Rot13 is the most common rotation because its halfway along the alphabet, its major drawback however is that it is extremely trivial to break.
You could have a look at cipher systems such as playfair, vignere, RSA(difficult, very secure), PGP, etc. Most cipher systems that are difficult to crack also involve some very complex mathmatics.
To write a simple encryption program in Qbasic you could either use a formula based method (eg rot13) on each letter or you could use a lookup table for encrypting each letter (requires that the table be transmitted to the reader of the code, but then how do you encrypt the table :???: ). Both methods should be relatively simple exercises in programming.
esus saves.... Passes to Moses, shoots, he scores!