Definition Checksum Error
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and removed. (August 2012) (Learn how and when to remove this template message) Effect of a typical checksum function (the Unix cksum utility) A checksum is a small-size datum checksum error wireshark from a block of digital data for the purpose of detecting errors
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which may have been introduced during its transmission or storage. It is usually applied to an installation file tera source file checksum error after it is received from the download server. By themselves, checksums are often used to verify data integrity, but should not be relied upon to also verify data authenticity. The actual http://searchsecurity.techtarget.com/definition/checksum procedure which yields the checksum, given a data input is called a checksum function or checksum algorithm. Depending on its design goals, a good checksum algorithm will usually output a significantly different value, even for small changes made to the input. This is especially true of cryptographic hash functions, which may be used to detect many data corruption errors and verify https://en.wikipedia.org/wiki/Checksum overall data integrity; if the computed checksum for the current data input matches the stored value of a previously computed checksum, there is a very high probability the data has not been accidentally altered or corrupted. Checksum functions are related to hash functions, fingerprints, randomization functions, and cryptographic hash functions. However, each of those concepts has different applications and therefore different design goals. For instance a function returning the start of a string can provide a hash appropriate for some applications but will never be a suitable checksum. Checksums are used as cryptographic primitives in larger authentication algorithms. For cryptographic systems with these two specific design goals, 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, computer words, single bytes, etc.). Some error-correcting codes are based on special checksums which not only detect common errors but also allow the original data to be recovered in certain cases. Contents 1 Algorithms 1.1 Parity byte or parity word 1.2 Modular sum 1.3 Position-dependent 1.4 General consideratio
computer's data is intact and unhampered. The data is scanned and tested for accuracy, either based on how well it relates to data elsewhere or based on previous data that was stored on the same computer. Essentially, all of the bits http://www.tech-faq.com/checksum-error.html of data in a particular document or file are added up and a number or hash is created. This number or hash can then be compared to the number or hash generated from the same file on another person's computer or http://www.yourdictionary.com/checksum at a previous time on the same computer. When does a Checksum Error Occur? Although a checksum error can occur at any time while a computer is comparing data, it is most commonly present during a computer's startup procedure. During a computer's checksum error start up processes, the BIOS settings, which are stored in a CMOS memory chip, are computed and then checked against the previous value. If the computed values do not match exactly, the computer warns the user with a checksum error message that the data may have been changed or corrupted between start up cycles. All BIOS programs present a different error and therefore will either continue with booting or refuse to boot until the problem is corrected. Depending on the type and the definition checksum error severity of the error generated, there may be one of a variety of ways to rectify the issue. The most common cause of a checksum error during the startup process is a faulty battery that is not providing sufficient power to the motherboard when the computer is off. However, motherboard malfunctions and viruses can also contribute to checksum errors. Other Types of Checksum Errors Another type of checksum error may occur with any program at any time. It is usual for many programs to now provide checksum information when that program is downloaded. Using a checksum program or MD5 hash checker, a user can quickly compare the checksum of a downloaded program with the checksum that the software developer provides. This is a common way to make sure that users are downloading the proper program and that no data was corrupted during the download process. Checksum errors originating from download errors can easily be corrected by re-downloading the problematic program. Follow Us! Rate this article: ★ ★ ★ ★ ★ Checksum Error, 3.44 / 5 (9 votes) You need to enable JavaScript to vote Mail this article Print this article Last updated 11 March, 2016. Related Posts How to Upgrade a CPU You can upgrade an older microprocessor to a newer one in easy steps. Before going ... Dual Core A dual core processor is part of a category called multi-core processors. These computer processors ... How to Overclock a CPU Overclocking is the process making
verb checksumNoun (plural checksums)a number, derived by applying a suitable algorithm to some data, used to check whether errors have occurred in transmission, storage or data entryVerb (third-person singular simple present checksums, present participle checksumming, simple past and past participle checksummed)To compute a checksum.checksum - Computer DefinitionA manner of checking the integrity of a set of data by summing all of the bytes of data, or otherwise combining through a series of arithmetic or other logical operations.The originating device appends the result of the calculation to the data set prior to storing or transmitting the data. The device that retrieves the stored data or receives the transmitted data repeats the calculation and compares the two checksums. If the two do not match exactly, it is assumed that the dataset is errored.This process detects many, but not all, errors, and includes no mechanism for error correction. Checksum is employed in an error control mode known as recognition and retransmission. See also cyclic checksum, error control, LRC, and recognition and retransmission. An integrity protection measure that is used primarily in data storage and networking protocols by adding the bytes or some other string of data components and storing the resulting value. Afterward, an individual having the checksum can confirm that the message was unchanged by performing the same operation on the data—in essence, checking the sum. Some errors—such as reordering the bytes in the message, putting in or taking out zero-valued bytes, and having multiple errors that increase and decrease the checksum in opposite directions—cannot be detected using the checksum integrity protection measure. To avoid this problem, cryptographic checksums have been introduced.See Also: Bytes; Cryptography or “Crypto.”
A value used to ensure dat