Obfuscator used by hack clients?

Hi.

Someone know, what's the name of the obfuscator used by hack clients like Vanity Client and Nyan Cat, that make the class and variable names like "MyModLa223843248302948204397324907032497238904729 83749802374897234"? Is it ProGuard, RetroGuard, or what...?

Thank you. =)

DJ JAVA DECOMPILE Well its not like that but it obfuscate

Different people use different obfuscators. That's why some clients are poorly obfuscated and cracked with ease.