Kerberos Authentication System – A Public Key Extension

Kerberos has become a mature, reliable, secure network authentication protocol. Kerberos is based on secret key encryption technology. It is the native network authentication protocol in the Microsoft Windows 2000 operating system and may be a candidate for use as a general-purpose authentication protocol for large user communities on the Internet. Several proposals have been developed that add public key cryptography to various stages of Kerberos to make the protocol work with large user communities and Public Key Infrastructures. But the computational requirements of public key cryptography are higher than those of secret key cryptography. As a result, the substitution of public key encryption algorithms for secret key algorithms impacts performance. As main disadvantage of Secret cryptography is that key is transferred over open system In this paper we provide alternative approach as Public crypto system in which private key is not shared