Which of the following integrity security mechanisms ensures that a sent message has been received intact, by the intended receiver?
A.
IPSEC
B.
SHA
C.
DES
D.
CRC
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Why wouldn’t Cyclic Redundancy Check be the correct answer?
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I believe the answer is CRC as it is an integrity verification tool.
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CRC is not “secure”. “Integrity security mechanisms” implies a level of security which CRC is just not associated with. DES is a cipher that encrypts and decrypts data in batches, or blocks, and can be said to provide a level of integrity check but typically security is handled by other means such as SSL or TLS. SHA is a hashing algorithm that creates a short, fixed-length message digest from a file or block of data. Hashing is often used to verify the integrity and/or originator of a file. However… IPsec is a suite of protocols that provides security and Confidentiality, Integrity, and Authentication of data. If one thinks of CRC, DES, and SHA providing a level of integrity check, they can be grouped together similarly. But I think the word “SECURITY” implies more than any one of those 3… and IPsec includes the integrity function, but ALSO security. So A:IPsec is probably correct.
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