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File verification is the process of using an algorithm for verifying the integrity of a computer file, usually by checksum.This can be done by comparing two files bit-by-bit, but requires two copies of the same file, and may miss systematic corruptions which might occur to both files.
Checksums are used as cryptographic primitives in larger authentication algorithms. For cryptographic systems with these two specific design goals [ clarification needed ] , see HMAC . Check digits and parity bits are special cases of checksums, appropriate for small blocks of data (such as Social Security numbers , bank account numbers ...
File integrity monitoring (FIM) is an internal control or process that performs the act of validating the integrity of operating system and application software files using a verification method between the current file state and a known, good baseline.
The following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information. This article is not all-inclusive or necessarily up-to-date. An overview of hash function security/cryptanalysis can be found at hash function security summary.
SHA-256: 256 bits Merkle–Damgård construction: SHA-384: 384 bits Merkle–Damgård construction: SHA-512: 512 bits Merkle–Damgård construction: SHA-3 (subset of Keccak) arbitrary sponge function: Skein: arbitrary Unique Block Iteration: Snefru: 128 or 256 bits hash Spectral Hash: 512 bits wide-pipe Merkle–Damgård construction Streebog ...
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Among other features, it can calculate various checksums, compare files, or shred files. [1] HxD is distributed as freeware and is available in multiple languages of which the English version is the first in the category of coding utilities on Download.com. [2] The c't magazine has featured HxD in several issues and online-specials. [3] [4]
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