本文分析了幾種主要的CRL 機制及OCSP 協議，并提出了一種離線模式下CRL 機制的改進方案——基于P2P 分布式CRL 列表的證書撤消系統，此系統利用CRL 發布點技術與重疊發布增量 CRL 機制相結合的理念，在數據源上對傳統CRL 列表發布機制進行了改進。在機制中運用P2P 技術實現了CRL 資源的共享，并將傳統的CRL 發布的C/S 體系結構改進成分散化的P2P 結構，使整個網絡的信息流量分散化，這不僅降低了系統負荷而且還發揮了對等網中資源版本越多越有利于資源的發現和共享的特點，提高了用戶查詢CRL 列表的及時性，加強了CRL 列表的離線性能。經實踐證明，方案具有較好的可行性。
關鍵詞：證書撤消列表；點對點技術；發布點
Abstract: In this paper we analyses existing CRL schemes and Online Certificate Status Protocol, then we describe an improved scheme of off-line CRLs—a distributed system for certificate revocation, based on peer-to-peer distribution of CRLs,this system has improved traditional CRL scheme in source data by distribution points together with Over-issued
Delta CRLs,Sharing CRLs can be realized in this system by peer-to-peer technology. This scheme has improved traditional client/server scheme to dispersive peer-to-peer scheme, and has dispersed information of the whole network. This scheme not only reduce the load on system but also exert characteristic of peer-to-peer technology, that is it have more resource more resource can be discovered and shared. This scheme has improved the timeless requirements and achieved good off-line functionary. By testing, this scheme has good feasibility.
Key words: CRL ;P2P;Distribution Point