State management (cookie) data is encrypted so that access control data included in the cookie is unable to be modified by the user. A hashing algorithm is performed using various fields in the cookie data and the hash value is encrypted. The hash value is combined with other data such as the user identifier...http://www.google.com/patents/US20050154887?utm_source=gb-gplus-sharePatent US20050154887 - System and method for secure network state management and single sign-on
