In this paper, the authors propose the explosive growth in the Internet, network security has become an inevitable concern for any organization business internal private network is connected to the Organization. Network security is against unauthorized access, alteration, or modification of information, and unauthorized Denial-of-Service (DoS). When a network is connected to the network that is valuable to potential in the attacks. Security of data can be done by a technique called cryptography. So one can say that cryptography is an emerging technology, which is important for network security. This paper covers the various cipher generation algorithms of cryptography which are helpful in network security.