In a network security protocol such as IPsec, a MAC may be used to provide integrity protection and origin authentication of messages sent between two peers that have previously established a shared private key.
Read moreWhat is integrity and ciphering?
Ciphering is needed when you want that only authorized people can ACCESS TO SEE the data. Integrity is when authorized people can ACCESS TO MODIFY the data . As you can see, both ciphering and integrity need an authentication and authorization phase before.
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