World Library  
Flag as Inappropriate
Email this Article

Trusted Information Systems

Article Id: WHEBN0002888401
Reproduction Date:

Title: Trusted Information Systems  
Author: World Heritage Encyclopedia
Language: English
Subject: IPsec, TIS, Steve Crocker, Marcus J. Ranum, Trusted operating system
Collection: Companies Established in 1983, Defunct Computer Companies
Publisher: World Heritage Encyclopedia

Trusted Information Systems

Trusted Information Systems, Inc.
Public (Former Nasdaq symbol:TISX)
Industry Computer software
Computer security
Fate Acquired by McAfee, later by SPARTA, Inc., which was acquired by Cobham, plc
Successor McAfee
Founded 1983
Founder Stephen T. Walker
Headquarters Glenwood, Maryland, United States
Area served
Products Firewall Software, IPSec VPN, Trusted OS

Trusted Information Systems (TIS) was a computer security research and development company during the 1980s and 1990s, performing computer and communications (information) security research for organizations such as NSA, DARPA, ARL, AFRL, SPAWAR, and others.


  • History 1
  • Products 2
  • Post Company 3
  • External links 4
  • References 5


TIS was founded in 1983 by NSA veteran Steve Walker,[1] and at various times employed notable information security experts including David Elliott Bell, Martha Branstad, John Pescatore, Marv Schaefer, Steve Crocker, Marcus Ranum, Wei Xu,[2][3] John Williams, Steve Lipner and Carl Ellison. TIS was headquartered in Glenwood, Maryland, in a surprisingly rural location; the company was started in Walker's garage on Shady Lane in Glenwood, MD. As the company grew, rather than move to Baltimore or the Washington D.C. suburbs, a small office building was constructed on land next to Walker's new home on Route 97.


TIS projects included as the following:

  1. Trusted Xenix, the first commercially available B2 operating system;
  2. Trusted Mach, a research project that influenced DTOS and eventually SELinux;
  3. Domain and Type Enforcement (DTE) which likewise influenced SELinux;
  4. FWTK Firewall Toolkit (the first open source firewall software) in 1993;
  5. Gauntlet Firewall in 1994 , one of the first commercial firewall products, with broad range of Internet Standards, including S/MIME, SNMP, DNS, DNSSEC, and many others;
  6. First e-mail server was hosted at TIS headquarters from June 1 of 1993 to January 20 of 1995;
  7. IP Security (IPSec) product in late 1994, known as the first IPSec VPN commercial product in IT history;
  8. Encryption Recovery product integrated with IPSEC, ISAKMP, IKE, and RSA.

TIS's operating system work directly affected BSD/OS, which the Gauntlet Firewall and IPSec was based on, as well as Linux, FreeBSD, HP UX, Sun OS, Darwin, and others.

Post Company

The company went public in 1996[4] and soon afterwards attempted to acquire Secure Computing Corporation (SCC), that used to be one of TIS's major competitors, because at the time McAfee wasn't interested in being a firewall vendor. The code base was integrated with Secure Computing's firewall product and branded Sidewinder Firewall, which then returned to McAfee when Secure Computing was acquired by them in 2008, and re-branded McAfee Enterprise Firewall. The end of this product line came in 2013, following McAfee's acquisition of another major firewall vendor, Finland-based Stonesoft. McAfee announced in October 2013 the intention to migrate their existing installed base of firewalls to Stonesoft's own Stonegate.

External links

  • LinkedIn Alumni Group
  • Firewall Toolkit Archive
  • Stephen Walker Congressional Testimony


  1. ^ Stephen Walker, Oral history interview, 8 November 2012. Charles Babbage Institute, University of Minnesota
  2. ^ IPSec#History
  3. ^ Application firewall
  4. ^ "Trusted Information Systems Initial Public Offering". 1996-08-30. Retrieved 2010-04-11. 
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.