This Paper proposes a kind of real-time, distributed, secure scheme to solve this problem efficiently and securely. This scheme can reduce the maintenance workload of system administrator, and has practical value .

• 文章提出了一种安全的分布式实时认证方案，安全、高效地解决了这一问题，减轻了系统管理员的维护工作量，具有实用价值。