Multicast is a type of group communication that plays very vital role in present communication technologies.  Multicasting is a kind of group communication where the security is main concern. Cryptography is basically oriented from computer science which is used Encryption and Decryption techniques for securing messages that are sent via insecure channel from sender and receiver. In internet era, security is very much necessary for group communication aspects. A number of cryptographic techniques are developed for achieving secure communication. we have initially survey some of the more popular and interesting algorithms currently in use. Some techniques use key and some are the keyless techniques. So, it is the good area of the research for comparative study of key and keyless techniques that are to be used. This paper focuses mainly on the comparative study of the Hash and MAC algorithms used for encryption in cryptography.

Index Terms – Cryptography, Multicast,Hash function, Algorithm, Key, keyless, MAC algorithm, Encryption