Even if some servers of the system are compromised, the private key of Certificate Authority will not leak and the system will continue to offer normal signature service for users, which achieves tolerance intrusion.

• 即使有一定数量的服务器被破坏,认证机构的私钥仍旧不会泄露,并且系统能够继续为用户提供正常的签名服务,实现了容忍入侵性。