what is keygen??

Keygen

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An example of a keygen.
A keygen (a portmanteau of "key generator") is a small program that will generate a cryptographic key for data encryption. An example is the ssh-keygen.
Programs that generate valid CD keys or serial/registration numbers for a piece of software are also commonly called keygens. These are made available by software cracking groups for free download on various websites dedicated to software piracy.

keygen既意思係Key Generator