Improved Trust-degree Model for PKI
In order to enhance accuracy of trust evaluation on subscribers(or key holders) by relying party,an improved trust-degree model for PKI is proposed.Through the introduction of key security period(KSP) and optimizing non-trust factor(NTF),the trust degree between certificate and private-key is clearly distinguished with the corresponding calculating formulas proposed.Meanwhile,the calculating methods for combined key trust degree and average key trust degree are given herein.This model integrates several critical factors that influence trust degree of certificate and private-key into one single formula,thus providing better adaptability to a variety of PKI trust models as well as sound calculating basis for improving the accuracy of trust evaluating on subscribers.