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In this section, we use HMAC to design and develop a message-based system to encrypt and decrypt messages using an RSA algorithm. We implement and verify both the integrity and authenticity of messages between the two campuses and the required procedures such as designing, developing, testing various operations documented with cryptool open-source software. The mechanism used by HMAC is called the Hash message authentication code (HMAC) It is a popular authentication mechanism used for authenticating a message using cryptographic hash functions. The strength of HMAC depends on the underlying properties of the cryptographic hash function. In today’s computing world HMAC providing a necessary way to check the integrity of the message transmitted.