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cksum is a command in Unix and Unix-like operating systems that generates a checksum value for a file or stream of data. The cksum command reads each file given in its arguments, or standard input if no arguments are provided, and outputs the file's 32-bit cyclic redundancy check (CRC) checksum and byte count. [1]
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.
The content of such spam may often vary in its details, which would render normal checksumming ineffective. By contrast, a "fuzzy checksum" reduces the body text to its characteristic minimum, then generates a checksum in the usual manner. This greatly increases the chances of slightly different spam emails producing the same checksum.
Btrfs has provisions for additional checksum algorithms to be added in future versions of the file system. [ 37 ] [ 87 ] There is one checksum item per contiguous run of allocated blocks, with per-block checksums packed end-to-end into the item data.
NT File System (NTFS) (commonly ... Microsoft's CryptoAPI and the EFS File System Run-Time Library (FSRTL). ... Checksum, unused Supposedly a checksum. 0x54
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.
Removes (deletes) files, directories, device nodes and symbolic links rmdir: Removes empty directories shred: Overwrites a file to hide its contents, and optionally deletes it sync: Flushes file system buffers touch: Changes file timestamps; creates file truncate: Shrink or extend the size of a file to the specified size vdir: Is exactly like ...
BSD checksum (Unix) 16 bits sum with circular rotation SYSV checksum (Unix) 16 bits sum with circular rotation sum8 8 bits sum Internet Checksum: 16 bits sum (ones' complement) sum24 24 bits sum sum32 32 bits sum fletcher-4: 4 bits sum fletcher-8: 8 bits sum fletcher-16: 16 bits sum fletcher-32: 32 bits sum Adler-32: 32 bits sum xor8: 8 bits ...