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mcrypt is a program for encrypting files or streams. It is intended to be a replacement for the old UNIX crypt. It uses well-known and well-tested algorithms like DES, BLOWFISH, TWOFISH, ARCFOUR, CAST-128, and more in several modes (CBC, CFB, etc.). It also has a compatibility mode with the old UNIX crypt and Solaris des. Some of the algorithms that mcrypt may use (like RC6 and IDEA) are not free in all countries. These algorithms are provided as extension modules to libmcrypt (the library which implements all the algorithms and modes found in mcrypt). Users should contact the companies listed in docs/README.nonfree, if you live in a country where is illegal to use them.


User manpage available in HTML format from


version 2.6.4 (stable)
released on 21 February 2003

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LicenseVerified byVerified onNotes
LGPLJanet Casey11 May 2001

Leaders and contributors

Nikos Mavroyanopoulos Maintainer

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Required to use libmhash (
Required to build libmhash
Source requirement libmhash

This entry (in part or in whole) was last reviewed on 1 May 2003.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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