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What is salted HMAC?
An HMAC combines the message (which can still be salted) with a key, giving us such a secret. Now, it’s fair to ask why a salt value could not simply be kept secret as a key, and concatenated to the message before hashing it with a primitive secure hash function.
Is HMAC a hash or encryption?
HMAC does not encrypt the message. Instead, the message (encrypted or not) must be sent alongside the HMAC hash. Parties with the secret key will hash the message again themselves, and if it is authentic, the received and computed hashes will match.
What’s the difference between OpenSSL Digest and hash?
I would give answer according to SO point of view. openssl_digest – Computes a digest. And In cryptography, a hash-based message authentication code (HMAC) is a specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key.
What is the difference between a HMAC and a hash of data?
TL;DR, an HMAC is a keyed hash of data. A good cryptographic hash function provides one important property: collision resistance. It should be impractical to find two messages that result in the same digest. An HMAC also provides collision resistance. But it also provides unforgeability. In order to generate an HMAC, one requires a key.
What’s the difference between message digest, message hash?
A message digest algorithm takes a single input — a message — and produces a “message digest” (aka hash) which allows you to verify the integrity of the message: Any change to the message will (ideally) result in a different hash being generated.
What’s the difference between a salt and a HMAC?
An HMAC incorporates additional secret data in the form of a key. This key is combined with the message in a much deeper way than a salt, and may be used in addition to a simple salt of the message.