Public Key Infrastructure
- Standards developed by the Open Group regarding PKI.
- http://archive.opengroup.org/public/tech/security/pki/index.htm

Query Certificate Managers
- Managing authenticated transmission of sensitive information over an insecure network.
- http://www.cis.upenn.edu/~qcm/

The Open Source PKI Book
- An attempt to register the available open source concerning PKI, and useful technical background info.
- http://ospkibook.sourceforge.net/

The PKI Page
- This page contains links to various sites and documents related to Public Key Infrastructure (PKI) material, especially links certificate authorities (CAs). (Stefan Kelm)
- http://www.pki-page.org/

NIST PKI Program
- An initiative to coordinate industry and technical groups developing PKI technology to foster interoperability of PKI products and projects. (National Institute of standards and Technology)
- http://csrc.nist.gov/pki/

Dartmouth College PKI Lab
- Project to develop inter-institutional applications. Includes related links, research information and results, and contact information.
- http://www.dartmouth.edu/~pkilab/

Digital Signature Links
- Provide links to digital signature legislation, infrastructure initiatives, standards, certification authorities, and trusted third parties. (Juan Avellan)
- http://www.qmw.ac.uk/~tl6345/