06178505 is referenced by 349 patents and cites 3 patents.

A scalable access filter that is used together with others like it in a virtual private network to control access by users at clients in the network to information resources provided by servers in the network. Each access filter use a local copy of an access control data base to determine whether an access request made by a user. Changes made by administrators in the local copies are propagated to all of the other local copies. Each user belongs to one or more user groups and each information resource belongs to one or more information sets. Access is permitted or denied according to of access policies which define access in terms of the user groups and information sets. The rights of administrators are similarly determined by administrative policies. Access is further permitted only if the trust levels of a mode of identification of the user and of the path in the network by which the access is made are sufficient for the sensitivity level of the information resource. If necessary, the access filter automatically encrypts the request with an encryption method whose trust level is sufficient. The first access filter in the path performs the access check and encrypts and authenticates the request; the other access filters in the path do not repeat the access check.

Title
Secure delivery of information in a network
Application Number
9/34576
Publication Number
6178505 (B1)
Application Date
March 4, 1998
Publication Date
January 23, 2001
Inventor
Michael B Ribet
Oak Brook
IL, US
Daniel Jensen
Van Nuys
CA, US
Laurence R Lipstone
Calabasas
CA, US
David S Schneider
Woodland Hills
CA, US
Agent
Gordon E Nelson
US
Assignee
Internet Dynamics
CA, US
IPC
H04L 9/32
View Original Source