Checksums definition of Checksums in the Free Online Encyclopedia.

checksum

A value used to ensure data are stored or transmitted without error. It is created by calculating the binary values in a block of data using some algorithm and storing the results with the data. When the data are retrieved from memory or received at the other end of a network, a new checksum is computed and matched against the existing checksum. A non-match indicates an error.

Just as a check digit tests the accuracy of a single number, a checksum tests a block of data. Checksums detect single bit errors and some multiple bit errors, but are not as effective as the CRC method. Checksums are also used by the Sophos antivirus software to determine if a file has changed since the last time it was scanned for a virus. See ECC memory and Sophos.

(storage, communications)

checksum - A computed value which depends on the contents of a block of data and which is transmitted or stored along with the data in order to detect corruption of the data. The receiving system recomputes the checksum based upon the received data and compares this value with the one sent with the data. If the two values are the same, the receiver has some confidence that the data was received correctly.

The checksum may be 8 bits (modulo 256 sum), 16, 32, or some other size. It is computed by summing the bytes or words of the data block ignoring overflow. The checksum may be negated so that the total of the data words plus the checksum is zero.

Internet packets use a 32-bit checksum.

See also digital signature, cyclic redundancy check.

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No references found	Unfortunately, for most software auto updaters, there is no easy way to tell if the patch is legitimate, so users are forced to check the MD5 checksums manually after downloading the update. Hot or not: Software update vulnerabilities by Amol Sarwate, manager, Vulnerabilities Research Lab / SC Magazine Barcode Checksums To ensure safe and error free reading and scanning of barcodes, all common barcode symbologies support so called checksum or check digit schemes. An Introduction to Barcodes by Humphrey Appleby / Computers and Internet community Red Hat, Caldera, Sun, IBM and SCO have since posted software fixes and checksums. LINUX MAIL VULNERABILITY: MUCH ADO ABOUT NOTHING? by Computergram International	checker checker plate checkerberry checkerboard regenerator checkered plate Checkers checkerwork checking Checking and Measurement Devices checking floor hinge checking program checking resistance checking routine Checking, Automatic checkline checkmate checkout checkout compiler Checkout Test language checkpoint checkpoint/restart checkroom Checkrow Planting checks and balances checksum Checksums checkup Cheddar Cheddi Jagan Cheder Chediak-Higashi anomaly Chedorlaomer cheek cheek boards cheek cut cheek pouch Cheek Pouches Cheekpiece Cheektowaga Cheerfulness Cheerhchen Ho Cheeryble Brothers Cheese cheese antenna cheese cement Cheese Fly cheese head Cheese Rolling Cheese Sunday Cheese Week cheesebox still	checks off checks off checks off checks on checks on checks on checks on checks on checks out checks out checks out checks out checks out Checks Payment Systems Association checks through checks through checks through checks through checks through checks up on checks up on checks up on checks up on checks up on Checkstand Checkstand Checkstring Checkstub Data Exchange checksum checksum Checksums Checksun Checksun checkto checkup checkup checkup checkup checkup Checkwork Checkwriting checkwriting privilege Checky CHECLC CHECMATE CHECO CHECS CHECSS CHECU CHED CHED CHED CHED CHED CHED-ZRC chedarim chedarim CHEDC CHEDCOM cheddar cheddar

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Unfortunately, for most software auto updaters, there is no easy way to tell if the patch is legitimate, so users are forced to check the MD5 checksums manually after downloading the update.

Hot or not: Software update vulnerabilities by Amol Sarwate, manager, Vulnerabilities Research Lab / SC Magazine

Barcode Checksums To ensure safe and error free reading and scanning of barcodes, all common barcode symbologies support so called checksum or check digit schemes.

An Introduction to Barcodes by Humphrey Appleby / Computers and Internet community

Red Hat, Caldera, Sun, IBM and SCO have since posted software fixes and checksums.

LINUX MAIL VULNERABILITY: MUCH ADO ABOUT NOTHING? by Computergram International

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