HMAC Algorithm in Computer Network - GeeksforGeeks

Last Updated : 31 Jul, 2024 Comments Improve HMAC(Hash-based Message Authentication Code) is a type of message authentication code (MAC) that is acquired by executing a cryptographic hash function on the data that is to be authenticated and a secret shared key. Like any of the MACs, it is used for both data integrity and authentication. In this article, we will discuss every point about HMAC.What is HMAC?HMAC algorithm stands for Hashed or Hash-based Message Authentication Code. It is a result of work done on developing a MAC derived from cryptographic hash functions. HMAC is a great resistance to cryptanalysis attacks as it uses the Hashing concept twice. HMAC consists of twin benefits of Hashing and MAC and thus is more secure than any other authentication code. RFC 2104 has issued HMAC, and HMAC has been made compulsory to implement in IP security. The FIPS 198 NIST standard has also been issued by HMAC.Objectives of HMACAs the Hash Function, HMAC is also aimed to be one way, i.e.,...