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What is the main purpose of using a hash with an AES cipher?

Posted on 2016-08-08
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What is the main purpose of using a hash with an AES cipher? Is the hash used for increased security or
to maintain data integrity?
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Question by:furuno
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by:Kyle Abrahams
Kyle Abrahams earned 1000 total points (awarded by participants)
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It's used to maintain data integrity.  Basically that what you have is actually what I sent.
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btan earned 1000 total points (awarded by participants)
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AES is for encryption and not for standard hashing. Digital signature (private key signed hash) is used for ensuring integrity instead of just hashing. Some may loosely state the signing is encryption (not using symmetric key like AES) which technically the operation for signing using private key (like using asymmetric key like RSA) is indeed encryption. Most of the time, the crypto algorithm for signing is used e.g. RSA-based signature schemes, such as RSA-PSS or DSA and its elliptic curve variant ECDSA
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by:furuno
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Thanks KA and btan.
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by:btan
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It is answered.
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