1. Re: Data Encryption
- Posted by Alan Tu <ATU5713 at COMPUSERVE.COM>
Jun 18, 1998
-
Last edited Jun 19, 1998
>>>>>
I use integers. If the number overflows (goes beyond 255 or below 0),
then I bring the number back into range. (A remainder(new_number, 256)
should do it, but I simply subtract (or add, if it's decrypting) 256 to
it to bring it back to it's allowed range.)
<<<<<
Let's suppose we seed a random number generator so that it returns these
two sequential numbers:
0, 255
Now you have two bytes you want to encrypt:
239, 240
Add =3D to 239, and you get the encrypted byte. 240+255 =3D 495. It
overflows, so subtract 256. You get 239. So 239 could mean 239 or 240. =
Is there any way to tell?
--Alan
=
