In recent years network security has become a very important issue. Encryption has come up as a solution and plays an important role in data security system. Several techniques are required to protect the shared data. Most commonly used encryption algorithms in the domain of cryptography firstly to identify their weaknesses and vulnerabilities and secondly to identify the aspects of those weaknesses which will be avoided by the correct implementation. In this paper, we provided different types of encryption algorithms that are existing and literature survey of those algorithms.