A Novel Key Generating Scheme of Automatic Variable Key

The major objectives of the computer networks are, sharing information and providing uninterrupted services over a distance. Because of the critical nature of computer networks and continuous development in information technology, the probability of getting hacked and leaking of the shared message becomes a bigger threat. Therefore, achieving perfect security in such shared data is an incredible research challenge. The pioneering work of Shannon on perfect security says that shared data can only be kept confidential if the length of the key is higher or equal to the size of the message. Therefore, in this paper, we have proposed a pseudorandom function which will take negotiated session keys and data block as a seed value and produce the required number of distinct keys i.e. Automatic Variable key (AVK) for each block of data transmission instead using the same key every time.