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| − | In cryptography, [[w:MD5|MD5]] (''Message-Digest algorithm 5'') is a widely used [[w:cryptographic hash function|cryptographic hash function]] with a 128-bit hash value. As an Internet standard (RFC 1321), MD5 has been employed in a wide variety of security applications, and is also commonly used to check the integrity of files. An MD5 hash is typically a 32-character hexadecimal number. Recently, a number of projects have created MD5 "[[w:rainbow table|rainbow table]]s" which are easily accessible online, and can be used to reverse many MD5 strings into their original meanings.
| + | #redirect [[Hash]] |
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| − | MD5 was designed by [[w:Ronald Rivest|Ronald Rivest]] in 1991 to replace an earlier hash function, [[w:MD4|MD4]]. In 1996, a flaw was found with the design of MD5; while it was not a clearly fatal weakness, cryptographers began to recommend using other algorithms, such as [[w:SHA hash functions|SHA-1]]. In 2004, more serious flaws were discovered making further use of the algorithm for security purposes questionable, but it's still very useful for simple data integrity purposes.
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| − | == Linux ==
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| − | On any Unix-like OS you can simply use the following command
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| − | {{code|<pre>md5sum filename</pre>}}
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| − | == Windows ==
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| − | On windows you can download one of the many available free MD5 hashing utilities, such as [{{SERVER}}/wiki/images/3/3b/MD5Win32.msi MD5Win32] by [http://www.kennethballard.com/ Kenneth Ballard]. After installing you can just right-click on a file and select "hash" from the context menu to obtain the MD5 hash of the file.
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| − | == Perl Module ==
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| − | [http://search.cpan.org/~delta/Digest-Perl-MD5-1.6/lib/Digest/Perl/MD5.pm Digest::MD5::Perl] is a perl implementation of [[w:Ronald Rivest|Ronald Rivests]] md5 hash algorithm. It is written in perl only and because of this it is slow but it works without C-Code. You should use Digest::MD5 instead of this module if it is available.
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| − | == See also ==
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| − | *[[Random numbers, Encryption and Hashing]]
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| − | [[Category:Maths]][[Category:dev]]
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