View source for Libcrypt

{{Distinguish2|[[Crypt_(Unix)#Library_Function|the POSIX C crypt function]]}}
{{Unreferenced|date=May 2011}}
'''Libcrypt''' is a [[copy protection]] mechanism developed by [[Sony]] for use in their [[PlayStation (series)|PlayStation]] systems. The protection consists of a two-stage verification algorithm: the first stage attempts to validate the game disc as an original PlayStation disc; following that, a [[checksum]] is then calculated from the data on disc and is passed as a [[magic number (programming)|magic number]] to subroutines.

The protection code is written in the PlayStation's native [[assembly language]], which is enough to thwart some older [[modchip]]s and [[Action Replay]]-like devices, as they work by intercepting library calls rather than tracing CPU registers. However, newer circumvention devices can emulate the response codes. The protection scanning software [[ClonyXXL]] rates Libcrypt as 2/5 skulls in terms of difficulty, implying that it is relatively easy to circumvent.

Only some PlayStation titles actually use Libcrypt – most are simply unprotected.

[[Category:Compact Disc and DVD copy protection]]
[[Category:Sony Interactive Entertainment]]
[[Category:PlayStation (brand)]]

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{{PlayStation-stub}} {{Source Wikipedia}}