Abstract: A Message Authentication Code is what we get from symmetric cryptography A MAC is used to prevent Intruder from creating a new message and inserting it in to original message. Signatures are generally used for verifying all the financial documents such as stamp papers for registration, payment receipts and for personal identification like Identity cards, marks reports. As all of these will have transactions of money and identity verification, it should be genuine in nature. Digital signature helps to identify the identity as well as to protect the integrity of message. In this paper, we compare the importance of digital signature and message authentication code for certification.
Keywords: Message authentication code, digital signature, key, Hash