Checksum - Revision history

Larsbrinkhoff: Error detection versus error correction.

2026-11-02T11:05:15Z

Error detection versus error correction.

← Older revision		Revision as of 11:05, 2 November 2026
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	A checksum usually is simply the sum of all the data items in a block of data (hence the name). Some checksums use slightly more elaborate math; e.g. the checksums typically used in the [[TCP/IP]] [[protocol suite]] involve adding carries back in, and those used in [[PARC Universal Packet\|PUP]] rotate the sum one position as each word is added in.		A checksum usually is simply the sum of all the data items in a block of data (hence the name). Some checksums use slightly more elaborate math; e.g. the checksums typically used in the [[TCP/IP]] [[protocol suite]] involve adding carries back in, and those used in [[PARC Universal Packet\|PUP]] rotate the sum one position as each word is added in.

			Checksums typically only provides enough information to ''detect'' an error in the data. Thus it's not a [[Redundant\|redundancy]] technique for error ''correction''.

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	[[Category: Computer Basics]]		[[Category: Computer Basics]]

Jnc: +cat

2018-12-16T16:47:52Z

+cat

← Older revision		Revision as of 16:47, 16 December 2018
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			[[Category: Computer Basics]]

Jnc: Proper cat

2018-10-18T14:39:28Z

Proper cat

← Older revision		Revision as of 14:39, 18 October 2018
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	A checksum usually is simply the sum of all the data items in a block of data (hence the name). Some checksums use slightly more elaborate math; e.g. the checksums typically used in the [[TCP/IP]] [[protocol suite]] involve adding carries back in, and those used in [[PARC Universal Packet\|PUP]] rotate the sum one position as each word is added in.		A checksum usually is simply the sum of all the data items in a block of data (hence the name). Some checksums use slightly more elaborate math; e.g. the checksums typically used in the [[TCP/IP]] [[protocol suite]] involve adding carries back in, and those used in [[PARC Universal Packet\|PUP]] rotate the sum one position as each word is added in.

	{{stub}}		{{semi-stub}}

Jnc: A start...

2018-06-14T12:37:47Z

A start...

New page

A '''checksum''' is a data protection mechanism, usually intermediate in power between [[parity]] and a [[cyclic redundancy check]]. (In some cases the term 'checksum' is applied to what is techically a CRC.)

A checksum usually is simply the sum of all the data items in a block of data (hence the name). Some checksums use slightly more elaborate math; e.g. the checksums typically used in the [[TCP/IP]] [[protocol suite]] involve adding carries back in, and those used in [[PARC Universal Packet|PUP]] rotate the sum one position as each word is added in.

{{stub}}