In 2000, Schneier published Secrets and Lies: Digital Security in a Networked World. In 2003, Schneier published Thinking Sensibly About Security in an Uncertain World.

Schneier writes a freely available monthly Internet newsletter on computer and other security issues, Crypto-Gram, as well as a security weblog, Schneier on Security. The weblog started out as a way to publish essays before they appeared in Crypto-Gram, making it possible for others to comment on them while the stories were still current, but over time the newsletter became a monthly email version of the blog, re-edited and re-organized.