A method to Implement the Kerberos User Authentication and the secured   Internet Service
  This paper proposes a PKINIT_AS Kerberos V5 authentication system to use public key cryptography and a method to implement the gssapi_krb authentication method and secured Internet service using it in IPSec VPN 
Pak Song-Ho, Pak Myong-Suk, Jang Chung-Hyok
cs.CR