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A tripcode is a means of telecommunication authentication that does not require registration. Tripcodes are most often used in 2channel-style message boards or Futaba Channel-style imageboards. A tripcode is a hashed password by which a person can be identified by others.
Readers of the board can identify postings made by the same user by comparing tripcodes. If two people use the same user name, they can be told apart because they, presumably, don't know each other's passwords that generate the different tripcodes. This way, the names and passwords don't have to be stored in a database. As many boards use the same algorithm, tripcodes are usually consistent.
With the advent of programs such as Tripcode Explorer and MTY[4], it is possible for users to generate custom tripcodes whose output contains some legible word or phrase rather than a random string of numbers. This is accomplished via a brute-force search using random inputs until an output matching the desired pattern is found. For example, using Tripcode Explorer to search for a tripcode which begins with the word "custom" reveals that the tripcode #&|7Wpt5@ generates the output CusTOmH3bM.
http://en.wikipedia.org/wiki/Tripcode
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