Cheat Engine

Evil_Intentions · Posted: Sat Sep 03, 2011 12:16 pm Post subject: Thoughts on this Cipher?

It's my own type of Vernam cipher. Those work by having a key string and input string. Each character of the input string is shifted by the value of the corresponding character of the key string. The only way to crack the code is to try every possible message.

These are not easy to use because if you have a message 1000 characters long, you and your recipient would need to have a 1000 character key. I decided to make my own way to do this.

Basically, you make a small key, say "TROLL" and pick a shift amount, say 3. Each "level" of the final key will take each character of the smallKey(SK from now on) Shift it by the shift amount, then add the character after next. So with out key and shift, the first level is:
WOULRLOTOR
Without a shift(or shift of 0) we have: TORLOLLTLR

This becomes the new SK for the next level, giving us.
ZURLXROLUOOTROWRRWUO
Without a shift(or shift of 0) we have:TROLROLLOLLTLLTRLTRO

Etc. etc.

The program automatically calculates the level needed to fully encrypt the input string, and the shift ensures the final key won't get into some nasty repeating patterns where entire words may be encrypted with the same character.

So thoughts on this system? All the power of a vernam cipher using simple keys.

Note: All shifts and character additions are done by casting the char to an int, applying the shift, then casting back to char. That means any symbol can be encrypted.

EXAMPLE:
"CEF is full of fucktards and pricks, but I love 'em all. <3" becomes
"Á¬ªl××sÍà¿Ú}ÉÔ„¹êÇÅÔÌÌË×ÈÙ·ŽÛÌÐÕÅá‚ÐÒÎ•¦ÓÓ×Ó}ÓÑsÖÐÆœ‹–¨"
with a SK of "TROLL" and shift of 7

Cheat Engine User · Posted: Sat Sep 03, 2011 12:27 pm Post subject:

How DO you apply the shift? As far as I know doing that sounds pretty strange unless you're going out of boundaries (above 255) which are changes that will be lost in the process.

Edit: Ah, like that, well, chars are numbers too in essence, no need to cast it to an int.

Evil_Intentions · Posted: Sat Sep 03, 2011 12:29 pm Post subject:

Kargarok · Posted: Sat Sep 03, 2011 12:32 pm Post subject:

I'm fucking confused.

Cheat Engine User · Posted: Sat Sep 03, 2011 12:33 pm Post subject:

Evil_Intentions · Posted: Sat Sep 03, 2011 12:35 pm Post subject:

Kargarok · Posted: Sat Sep 03, 2011 12:36 pm Post subject:

3: You guys make me feel stupid

Evil_Intentions · Posted: Sat Sep 03, 2011 12:43 pm Post subject:

While you're here holland, what are your thoughts on it?

I mean, I realize it'll never really be used anywhere, but as a shits and gigs project how is it?

Anything else I could add during the encryption process? Possibly another shift at a certain point or character to further vary final strings?

Noz3001 · Posted: Sat Sep 03, 2011 12:46 pm Post subject:

'Tis all zero's and one's

Evil_Intentions · Posted: Sat Sep 03, 2011 1:10 pm Post subject:

If anyone wants to see the source so far. Need to add in the matrix encryption, then I'll start working on the decryption class and add documentation.

http://pastebin.com/MsTZD2PT

to use, just do something like this:
Encrypt enc = new Encrypt();
System.out.println(enc.Vernam("Hello World", "TRULUL", 4));
System.out.println(enc.Caeser("Hello World", 3));

Noz3001 · Posted: Sat Sep 03, 2011 1:16 pm Post subject:

NO SPACES IN SOURCE CODE

>java

u cerial?

Evil_Intentions · Posted: Sat Sep 03, 2011 1:22 pm Post subject:

Killor1 · Posted: Sat Sep 03, 2011 1:24 pm Post subject:

Evil_Intentions · Posted: Sat Sep 03, 2011 3:56 pm Post subject:

mfw noone comments on the cipher itself

;-;
;~;
;^;

Kargarok · Posted: Sat Sep 03, 2011 4:00 pm Post subject:

I don't know anything at all about this, but it looks complicated and cool ^.^ Was it hard to make?