A checksum (also called a hash total) is {{Quote|[a] mathematical value that is assigned to a file and used to 'test' the file at a later date to verify that the data contained in the file has not been maliciously or erroneously changed.
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| - A checksum (also called a hash total) is {{Quote|[a] mathematical value that is assigned to a file and used to 'test' the file at a later date to verify that the data contained in the file has not been maliciously or erroneously changed.
- A checksum was a procedure by which an individual could determine if a computer file had been corrupted by comparing two sets of data for discrepancies in total aggregate amounts of data bits stored. In 2364, upon discovering the confession of Captain Jean-Luc Picard for mistakenly destroying an unarmed starship at the Battle of Maxia by confusing a subspace antenna for a weapons cluster aboard the USS Stargazer, Commander William T. Riker ordered Lieutenant Commander Data for an evaluation of the authenticity of the confession. Data compared the total number of bits of the logs contained in the main computer core to those found in the personal logs of Captain Picard, which resulted in checksum discrepancies being discovered. Data concluded that one of the two had been forged by the Fereng
- A mathematical function used to check data transmissions for errors. Some synth manufacturers add checksums to long MIDI sysex transmissions (such as patch dumps) that their synths transmit or receive. The checksum function adds one or two bytes to the sysex when it is transmitted. These bytes contain the result of some mathematical function that is calculated from the other data bytes in the sysex string (a number of different functions exist, and manufacturers may use different ones). When the sysex is sent back to the synth, it re-calculates the checksum on the received data and then compares it to the checksum contained in the transmission. If they don't match, a transmission error has occurred.
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| abstract
| - A checksum was a procedure by which an individual could determine if a computer file had been corrupted by comparing two sets of data for discrepancies in total aggregate amounts of data bits stored. In 2364, upon discovering the confession of Captain Jean-Luc Picard for mistakenly destroying an unarmed starship at the Battle of Maxia by confusing a subspace antenna for a weapons cluster aboard the USS Stargazer, Commander William T. Riker ordered Lieutenant Commander Data for an evaluation of the authenticity of the confession. Data compared the total number of bits of the logs contained in the main computer core to those found in the personal logs of Captain Picard, which resulted in checksum discrepancies being discovered. Data concluded that one of the two had been forged by the Ferengi. It was later concluded that DaiMon Bok had forged the confession in an effort to discredit Captain Picard, whom he blamed for the death of his son in 2355. (TNG: "The Battle" )
- A mathematical function used to check data transmissions for errors. Some synth manufacturers add checksums to long MIDI sysex transmissions (such as patch dumps) that their synths transmit or receive. The checksum function adds one or two bytes to the sysex when it is transmitted. These bytes contain the result of some mathematical function that is calculated from the other data bytes in the sysex string (a number of different functions exist, and manufacturers may use different ones). When the sysex is sent back to the synth, it re-calculates the checksum on the received data and then compares it to the checksum contained in the transmission. If they don't match, a transmission error has occurred. The MIDI standard contains no specification for when a checksum should be used, or what to do when a sysex with an incorrect checksum is received. Most synths will silently ignore a sysex with an incorrect checksum; a few will indicate the error to the performer.
- A checksum (also called a hash total) is {{Quote|[a] mathematical value that is assigned to a file and used to 'test' the file at a later date to verify that the data contained in the file has not been maliciously or erroneously changed.
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