The message that originated from an authorized user is defined as User Authentication and is provided by Message Authentication codes (MAC). The provision of assurance that the message is not been modified is defined as Message Authentication and is provided by Hash functions. Authenticated code is generated when MAC uses Hash function it is called Hash based MAC (HMAC). In this paper an algorithm is proposed for HMAC which uses SHA-2 as cryptographic hash function. The algorithm is implemented using GUI based controls in MATLAB toolbox which enables the algorithm to be friendly with the user. Theoretical analysis and experimentation show that this hash function is with high plaintext sensitivity and low collision resistance, and secure against birthday attacks or meet-in-the-middle attacks. These properties make it a suitable choice for data signature or authentication.

Some industrial systems are di cult to formally verify due to their large scale. In particular, the widespread use of lookup tables in embedded systems across diverse industries, such as aeronautics and automotive systems, create a critical obstacle to the scalability of formal veri cation. is paper presents Osiris, a tool that automatically computes abstractions of lookup tables. Osiris uses these abstractions to verify a property in rst order logic. If the veri cation fails, Osiris uses a falsi cation heuristic to search for a violation of the speci cation. We validate our technique on a public benchmark of an adaptive cruise controller with lookup tables. CCS CONCEPTS•So ware and its engineering →So ware veri cation;