Simple file verification: Difference between revisions

Revision as of 15:04, 10 September 2018

Revision as of 15:07, 10 September 2018

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{{ infobox file format

| name = Simple file verification

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== Checksum ==

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Files can become corrupted for a variety of reasons including faulty [[Computer Storage|storage media]], errors in [[Transmission (telecommunications)|transmission]], write errors during [[copying]] or moving, and [[software bug]]s. SFV verification ensures that a file has not been corrupted by comparing the file's [[cyclic redundancy check|CRC]] [[Hash function|hash]] value to a previously calculated value. Due to the nature of hash functions, [[hash collision]]s may result in [[false positive]]s, but the likelihood of collisions is usually negligible with random corruption. (The number of possible checksums is limited though large, so that with any checksum scheme many files will have the same checksum. However, the probability of a corrupted file having the same checksum as its original is exceedingly small, unless deliberately constructed to maintain the checksum.)

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=== Command-line utility ===

An example of an [[open-source]] [[cross-platform]] [[command-line]] utility that createsoutputs crc32 checksums is [[7-Zip]].<ref>{{cite|url=https://sevenzip.osdn.jp/chm/cmdline/commands/hash.htm|title=h (Hash) command|work=[[7-Zip]]|date=May 23, 2016}}</ref>

== See also ==

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* [[Parchive]]

==External linksReferences ==

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* [http://www.webutils.pl/SFV_Calculator Online SFV Calculator]

* [http://www.quicksfv.org/ QuickSFV] SFV checksum verifier (Windows Vista or earlier and Linux)

* [http://wxchecksums.sourceforge.net/mainpage_en.html wxChecksums]- Opensource Windows/Linux application

* [http://zakalwe.fi/~shd/foss/cksfv/ Check SFV - SFV software for UNIX systems]

* [http://www.julifos.com/soft/checksum/index.html checkSum+], Mac OS X, MD5 compatible, free

* [http://sourceforge.net/projects/isfv isfv] sfv checksum verifier for Mac OS X

[[Category:Computer file formats]]