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Does Mac use public key encryption?
MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. In contrast, a digital signature is generated using the private key of a key pair, which is public-key cryptography.
Does public key encryption use two keys?
In a public key system, two keys are used, one for encrypting and one for decrypting. The two keys are mathematically related to each other but knowing one key does not divulge the other key. The two keys are called the “public key” and the “private key” of the user. The network also has a public key and a private key.
When to use MAC codes for authenticated encryption?
Another scenario to use MAC codes is for authenticated encryption: when we encrypt a message and we want to be sure the decryption password is correct and the decrypted message is the same like the original message before encryption. First, we derive a key from the password.
How is the HMAC key used in encryption?
1 Answer 1. An HMAC key is a symmetric key, i.e. a bunch of bytes. The “symmetry” relates to the following important fact: the very same key is used both to produce a HMAC value over some message, and to verify the HMAC value over the message.
How is the HMAC key exchanged with a PKI?
The complete picture is that PKI is used to distribute public keys, and these public keys are then used with asymmetric cryptography to dynamically create a shared secret, and that shared secret is then used with symmetric algorithms such as HMAC. So you do not distribute HMAC keys directly with a PKI; there is one intermediate layer.
How is the HMAC key exchanged in SSL / TLS?
In SSL/TLS, the usual MAC algorithm is HMAC. The complete picture is that PKI is used to distribute public keys, and these public keys are then used with asymmetric cryptography to dynamically create a shared secret, and that shared secret is then used with symmetric algorithms such as HMAC.