05983350 is referenced by 287 patents and cites 61 patents.

A system and method for regulating the flow of messages through a firewall having a network protocol stack, wherein the network protocol stack includes an Internet Protocol (IP) layer, the method comprising establishing a security policy, determining, at the IP layer, if a message is encrypted, if the message is not encrypted, passing the unencrypted message up the network protocol stack to an application level proxy, and if the message is encrypted, decrypting the message and passing the decrypted message up the network protocol stack to the application level proxy, wherein decrypting the message includes executing a process at the IP layer to decrypt the message.

Title
Secure firewall supporting different levels of authentication based on address or encryption status
Application Number
8/715343
Publication Number
5983350
Application Date
September 18, 1996
Publication Date
November 9, 1999
Inventor
Troy de Jongh
Bloomington
MN, US
Edward B Stockwell
St. Paul
MN, US
Spence Minear
Fridley
MN, US
Agent
Schwegman Lundberg Woessner & Kluth P A
Assignee
Secure Computing Corporation
MN, US
IPC
H04K 1/00
View Original Source