IAM in Service Catalog
There is a lot of information available. One source of introductory documents is http://pkiforumwww.oasis-pki.org/whitepapers.html, from the OASIS PKI Forum. There are lots of good books about PKI and related security issues; one comprehensive book is: "Understanding the Public-Key Infrastructure: Concepts, Standards, and Deployment Considerations" by Carlisle Adams, Steve Lloyd, Stephen Kent (ISBN: 157870166X)
Note that in the field of PKI there are many technologies, and many differing opinions about how to use them.