Research on the POP of encryption key as certificate updating;

This aritcle propose a scheme of using LDAP Directory to solve POP problem in PKI, compares with other schemes, and analyses the usability of the scheme.

In order to prevent illegal users from visiting legal resource, the authors analyze the problems existing in the standard of security protocol and put forward a private key certificate contain attribute.

Aiming at drawbacks of larger communication quantity and computation quantity in authenticated encryption scheme that is used today based on certificate, a publicly verifiable authenticated encryption based on self-certified public keys is proposed in this paper.