Anybody tried the ASCII

[robherc]

Has anybody tried to encrypt-decrypt by mathematically altering the ASCII code for a message/file? If so, please give me some pointers as to what does/does not work as I'm having real troubles with my app.<br>
<br>
<br>
Thanks<br>
-robherc<br>
robherc@netzero.net

 

[Alt255]

Sure. Keep it simple.<br>
Send me a sample and I'll see if I can find the problem.

 

[Alt255]

Here. This is easy to code and difficult to break. QBASIC.<br>
<br>
INPUT "Enter key:", CryptKey&<br>
RANDOMIZE CryptKey&<br>
FOR R = 1 to LEN(Message$)<br>
MID$(Message$,R,1)=CHR$((INT(RND*255)+1)XOR ASC(MID$(Message$,R,1)))<br>
NEXT<br>
<br>
The same routine encrypts and decrypts based on the value of CryptKey&. Anyone trying to break the code would have to try all possible values for CryptKey&. Could be done... but it would take some time.<br>

 

[Alt255]

Errr... "hypothetically" of course. Don't bet your James Bond on it until you debug it.