Find out Encryption

[TmC]

and if it is a custom algorythm?

[aldente]

I don't think so.

Let me explain:

There are several programs by one company, which communicate over the web, and use encryption to protect their data.

One (an Applet) uses simple DES-encryption (encrypted by an PHP-Script), and I already found the key. It does not consist of arbitrary hex-values, converted to ASCII-characters, it's a nice word

It's likely, that the other programs (Win32) use the same key, but obviously different encryption. I may be completely wrong, but I think it's worth a try, before I spend hours with disassembling and analyzing the algorithm.

[TmC]

Try the peID plugin.

[gigaman]

Yes, try KANAL plugin for PEiD.
However, it works differently than you expected. It scans the file for known constants, strings etc. - thus identifying the algorithm. No encryption/decryption takes place.

[bukkake]

There is also "Crypto Searcher" by x3chun, you can find it here hxxp://x3chun.wo.to/

I think there has no such mothed to find out the encryption.
First. there has so many encryptions include user define encryption that you even cann't know.
Second. encryptions just convert a binary stream to another. It has no feathers in it.

Maybe you can get some clue by the binary stream. But it is very difficult and not exactly.

[gigaman]

True, there's an infinite number of encryptions - but the real applications often use "standard" ones, possibly even using common libraries.