How to find out the encrytion algorithim for a software.

[sgpiggybank]

Hi all,

Currently I have the serial number and the security code to unlock the software. Does anyone knows how can i know the encrytion algorithim in it? Any software for that?

Example:

Serial No. 9339
Security code. 7238272

How to know the encrytion code between it. Thank you all.

Rdgs
sgpiggybank

[Devine9]

Well you've gotta pull apart the software and find out how its working. That's the whole idea. Visit #cracking4newbies on efnet and http://krobar.cjb.net perhaps, if you want a starting place.

cheers,

Devine Right [RET]

[codebreaker]

thats the 1,000,000$ question .

Find the protection -> understand it -> destroy it -> drink beer 8)

some people mix the order though :shock:

more good websites : http://www.yates2k.net/ , http://its.mine.nu/

[Acid_Cool_178]

yet another good web site: www.reteam.org (http://www.reteam.org)

[sna]

infinite recursion :cry:

[GEEK]

1. disassemble it

2. study the code

thts it. :D

[Darawk]

The first thing you should do is run the PEiD plugin "Krypto Analyze" on it. You can get PEid just about everywhere, and the stock plugins are accessible from the little "->" button in the bottom right. Krypto Analyze will search for cryptographic "signatures", which usually means unique large numbers that are used by various algorithms. If this doesn't get you what you're looking for, i'd suggest searching the file for xor's with differing operands. An xor operation with non-identical operands that isn't crypto or compression related is very rare in my experiences(i've only seen it used in one type of tricky compiler optimization...the specifics of which I can't recall at the moment, and then the odd explicit use of it by the programmer for control-flow, though that is VERY rare). If you still come up empty-handed, then your best bet is to set a memory breakpoint on the input data, and just wait for it to be accessed by the crypto code.