Enhanced MAC based on Hybrid-MD Algorithm

In the digital era like now almost all transactions are done in online. However, information on the results of transactions sent through digital communication channels are very vulnerable to counterfeiting attacks. Therefore, it is made to ensure that the received message information is still intact and genuine. A MAC is a cryptographic algorithm that is suitable and widely used as a solution for such problems even though there are still many tricks that can be used by attackers to find fake messages for deceive other parties. The secure Ok-MAC algorithm developed in this paper is that enhanced MAC uses a message digest based on a hybrid of two existing message digests using just one key. The test results show that for the small-sized message the MAC algorithm Ok-MAC is slightly slower (26.53 ms) than the HMAC-SHA-1 (24.94 ms) and Ok-MAC is expected to validate the integrity and authenticity of the sort message well.