The CILogon project facilitates secure access to CyberInfrastructure (CI).

To log on to the CILogon Service, visit

Services that support access via CILogon include:

CILogon is a research and scholarship service provider in the InCommon federation.

CILogon is an open source project, with source code and downloads hosted at SourceForge.

To cite CILogon in publications, please use:

Jim Basney, Terry Fleury, and Jeff Gaynor, "CILogon: A Federated X.509 Certification Authority for CyberInfrastructure Logon," Concurrency and Computation: Practice and Experience, Volume 26, Issue 13, pages 2225-2239, September 2014.

For more information, please see our Frequently Asked Questions or contact

Latest News

  • SSLv3 disabled on In response to the SSLv3 POODLE vulnerability, we have disabled support for SSLv3 at TLS is now required for access. We do not see any recent use ...
    Posted Oct 15, 2014, 7:59 AM by Jim Basney
  • Migration to Google OpenID Connect CILogon ( has migrated from OpenID 2.0 to OpenID Connect for the Google identity provider, per Google's recommendations. When CILogon users log on using Google identities ...
    Posted Aug 15, 2014, 11:26 AM by Jim Basney
  • Phasing Out CILogon's Use of ProtectNetwork The CILogon project does not plan to renew its subscription to the ProtectNetwork identity provider (IdP) service in 2015 because of a significant price increase. Users who log on to ...
    Posted Aug 7, 2014, 11:10 AM by Jim Basney
Showing posts 1 - 3 of 79. View more »

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This material is based upon work supported by the National Science Foundation under grant numbers 0850557, 0943633, and 1053575 and by the Department of Energy under award number DE-SC0008597.
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the United States Government or any agency thereof.
The CILogon project is sometimes referred to as CILogin, but the official name is CILogon.