Latest Cognos Proven Practices document on Security

A good document to refer if you are planning to secure your Cognos environment. Covers all the authentication and authorization concepts that you need:
http://www.ibm.com/developerworks/data/library/cognos/security/cognos_bi_platform/page602.html

Also, here is the list of Top 10 Cognos Proven Practices documents for reference:
http://www.ibm.com/developerworks/data/library/cognos/top_10_bi_provenpractices.html