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BSD checksum information


The BSD checksum algorithm was a commonly used, legacy checksum algorithm. It has been implemented in old BSD and is also available through the sum command line utility.

This algorithm is useless from a security perspective, and is weaker than the CRC-32 cksum for error detection.[1][2]

  1. ^ sum(1) — manual pages from GNU coreutils
  2. ^ sum(1) – FreeBSD General Commands Manual

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BSD checksum

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The BSD checksum algorithm was a commonly used, legacy checksum algorithm. It has been implemented in old BSD and is also available through the sum command...

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Checksum

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File verification Fletcher's checksum Frame check sequence cksum md5sum sha1sum Parchive Sum (Unix) SYSV checksum BSD checksum xxHash Error correction Hamming...

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List of hash functions

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redundancy checks, checksum functions, and cryptographic hash functions. Adler-32 is often mistaken for a CRC, but it is not: it is a checksum. Hash function...

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SYSV checksum

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bytes does not change the checksum. As a result, many common changes to text data are not detected by this method. The FreeBSD pseudocode for this algorithm...

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Generic Routing Encapsulation

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to encapsulate IP data to/from Packet Control Function (PCF). Linux and BSD can establish ad-hoc IP over GRE tunnels which are interoperable with Cisco...

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Comparison of file systems

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however Direct/indirect/triple-indirect block maps are not protected by checksums Creation time stored since June 2015, xfsprogs version 3.2.3 The local...

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NMEA 0183

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included if a checksum is supplied. The asterisk is immediately followed by a checksum represented as a two-digit hexadecimal number. The checksum is the bitwise...

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Cksum

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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...

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MD5

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function MD4, and was specified in 1992 as RFC 1321. MD5 can be used as a checksum to verify data integrity against unintentional corruption. Historically...

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Network address translation

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In this type of NAT, only the IP addresses, IP header checksum, and any higher-level checksums that include the IP address are changed. Basic NAT can...

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Operating system

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legal disputes, the BSD project spawned a number of free derivatives, such as NetBSD and FreeBSD (both in 1993), and OpenBSD (from NetBSD in 1995). macOS...

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Gzip

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The 'g' in this specific version stands for gratis. FreeBSD, DragonFly BSD and NetBSD use a BSD-licensed implementation instead of the GNU version; it...

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Rsync

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check if invoked with --checksum. This forces a full checksum comparison on every file present on both systems. Barring rare checksum collisions, this avoids...

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Btrfs

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Comparison of file systems HAMMER – DragonFly BSD's file system that uses B-trees, paired with checksums as a countermeasure for data corruption List of...

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IPv6

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security issues. Moreover, an IPv6 header does not include a checksum. The IPv4 header checksum is calculated for the IPv4 header, and has to be recalculated...

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ExFAT

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parameters and the checksum sector. (There are two VBR type regions, the main VBR and the backup VBR.) The checksum sector is a checksum of the previous...

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Md5sum

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Retrieved 2018-11-02. "md5sum: Compute MD5 Checksums". rdrr.io. Retrieved 2018-11-02. md5(1) – FreeBSD General Commands Manual md5sum(1) – Linux User...

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WinRAR

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user to test the integrity of archives, WinRAR embeds CRC32 or BLAKE2 checksums for each file in each archive. WinRAR supports creating encrypted, multi-part...

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PeaZip

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manager and file archiver for Microsoft Windows, ReactOS, Linux, MacOS and BSD by Giorgio Tani. It supports its native PEA archive format (supporting compression...

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Datagram Congestion Control Protocol

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HC-Sender CCID Checksum Coverage (CsCov) (4 bits) Checksum Coverage determines the parts of the packet that are covered by the Checksum field. Checksum (16 bits)...

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List of file systems

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"hammer2_disk.h". BSD Cross Reference. DragonFly BSD. Retrieved 2019-03-06. Matt Dillon (2018-12-09). "hammer2/DESIGN". BSD Cross Reference. DragonFly BSD. Retrieved...

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Fsck

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system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD. The equivalent programs on MS-DOS and Microsoft Windows are CHKDSK, SFC...

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ZFS

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version of ZFS was ported to Linux, Mac OS X (continued as MacZFS) and FreeBSD. In 2010, the illumos project forked a recent version of OpenSolaris, including...

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IPv6 transition mechanism

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prefix was chosen to yield a zero-valued checksum to avoid changes to the transport protocol header checksum. The algorithm can be used in a solution...

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