An intermediate system provides remote clients with access to a primary system, such as a server. The intermediate system creates and stores a log-in record for each client. The log-in record contains an encrypted primary system client identifier (PSCI). The PSCI contains authentication information for...http://www.google.com.hk/patents/US7003668?utm_source=gb-gplus-share專利 US7003668 - Secure authentication of users via intermediate parties
