Tripcode - Everything Anon Knows

A tripcode is a neat little user-identity system that 2ch thought up, and has been extensively copied by every other anonymous board in existence. At its core, a tripcode is simply a way to authenticate that a user is who they say they are without a login system, or even record-keeping.

Here's the non-technical explanation: most imageboards allow one to attach a name to one's post; i.e. "anon". A code can then be attached to the end of this name, with a separating mark of some kind between them (usually # and ! are triggers for tripcodes). So, the string anon#tripcode translates to anon!3GqYIJ3Obs. The string 3GqYIJ3Obs is the result after tripcode has been hashed, spliced, and otherwise mangled by the board software.

Because this system is insecure (given a moderately powerful computer and some time, any tripcode can be brute-forced), secure tripcodes have also been invented. These are usually triggered by the presence of a second # or !. The reason that these are more secure is that they use a secret, board-specific salt for their generation, making their brute-forcing highly difficult and currently out of the realm of the desktop computer. They are not, however, "secure" in the strictest sense. Unfortunately, they are not portable; that is, they're different for every site, because the salts are different. For most users, however, regular tripcodes are plenty secure.

Tripcode Chart
`#tripcode`	->	`!3GqYIJ3Obs`
`anon#tripcode`	->	anon`!3GqYIJ3Obs`
`##tripcode`	->	`!!yIk1wB2J`*
`#tripcode#tripcode`	->	`!3GqYIJ3Obs!!yIk1wB2J`*

*yIk1wB2J is what [1] generates; it will vary from site-to-site.

(in)Famous Tripcodes
`#`	->	`!jPpg5.obl5`
`#kami`	->	`!yGAhoNiShI`
`SovietRussia#deadjew`	->	SovietRussia`!lM51PoudCg`
`moot#faggot`	->	moot`!Ep8pui8Vw2` - 4chan: results in an autoban.
`MODD#withtripcode`	->	MODD`!5JrU4QOlH6`
`#ｋａｍｉ`	->	`!yGAhoNiShI` - This is an in-joke in Japan.