Computer Security Training
Computer Security Training

Learn how to secure your business from attacks with our practical security courses, taught by top experts in their fields

Hands-on courses for developers and system administrators taught in small classes, in the heart of London's Tech City. Course topics include SSL/TLS and PKI, Content Security Policy, and ModSecurity. Available on-site.

Bulletproof TLS Newsletter

Bulletproof TLS Newsletter is a free notification service that brings you fresh SSL/TLS and Internet PKI news. This newsletter came out of need to send regular and sometimes urgent notifications to the readers of my books interested in encryption. I aim to send newsletters infrequently, at most once a month. MORE »

SSL/TLS and PKI History

A comprehensive history of the most important events that shaped the SSL/TLS and PKI ecosystem, based on our book Bulletproof SSL and TLS. MORE »

Our Books

Apache Security 2005  FREE
This all-purpose guide for locking down Apache arms readers with all the information they need to securely deploy applications. Administrators and programmers alike will benefit from a concise introduction to the theory of securing Apache, plus a wealth of practical advice and real-life examples.

The complete guide to deploying secure servers and web applications.This book, which provides comprehensive coverage of the ever-changing field of SSL/TLS and Web PKI, is intended for IT security professionals, system administrators, and developers, with the main focus on getting things done.

The definitive guide to the popular open source web application firewall, written by Ivan Ristić, the principal author of ModSecurity. This book contains everything you need to successfully deploy and maintain a ModSecurity installation, in one place. A subset of this book, ModSecurity Handbook: Getting Started, is free.

OpenSSL Cookbook 2015  FREE
This free book provides complete coverage of OpenSSL installation, configuration, and key and certificate management. The appendix includes SSL/TLS Deployment Best Practices, a concise guide to designing and deploying secure web sites and applications.

Digital Books from Other Publishers

In addition to publishing our own books, we provide digital distribution services to other publishers. The following books are currently distributed by us:


Computer Security Courses
2 June 2016

We are thrilled to announce our amazing and unique computer security courses! Held in small groups and led by experts, courses include SSL/TLS, Content Security Policy and Apache/ModSecurity. Classroom and in-house courses available.  MORE »

Bulletproof SSL and TLS First Revision
7 September 2015

We published the first complete revision of Bulletproof SSL and TLS. Because this was an in-place update for the paperback (no formal new edition), bookstores will start selling it once they deplete their existing stock. Naturally, we always provide the most recent digital version on our web site. More information here and here.

OpenSSL Cookbook 2ed Now Available
3 March 2015

The second edition of our free guide to OpenSSL adds improvements to the existing text as well as introduces another new chapter that covers secure server assessment.

Free Apache Security Now Available
10 February 2015

Apache Security is the latest free book in our offering. It is a digital reprint of Ivan's well-known title originally published by O'Reilly in 2005. You can read it online straight away, or download it for later (PDF, EPUB, Kindle) after registration.

Feisty Duck Sponsors EFF Electronic Frontier Foundation
21 January 2015

Feisty Duck is happy to sponsor the work of the Electronic Frontier Foundation by donating a Bulletproof SSL and TLS licence for all their employees.