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

The Best TLS Training

3 May (London), 14 September (London)

This practical course will teach you how to deploy secure servers and encrypted web applications during a day packed with theory and practical work. MORE »

Internet PKI in Depth

4 May (London), 15 September (London)

Spend a full day to understand both the theory and practice of Internet PKI. Based on the book Bulletproof SSL and TLS. MORE »

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

The definitive guide to the popular open source web application firewall, written by Christian Folini and Ivan Ristić, the principal author of ModSecurity. This book contains everything you need to successfully deploy and maintain a ModSecurity installation, in one place.

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.

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.

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:


Programming in Lua 4Ed Now Available!
26 April 2017

We are very happy to announce that the fourth edition of the excellent Programming in Lua is now available as an ebook.  MORE »

Feisty Duck Training in Norway!
22 February 2017

The Best TLS Training in the World and Internet PKI in Depth are going to Oslo! Training dates: 5th and 6th April 2017 - Join us!  MORE »

Working with Manicode Security
6 January 2017

We are thrilled to announce that we are starting 2017 by working with Jim Manico and Manicode Security.  MORE »

ModSecurity Handbook Second Edition now available for early access
15 November 2016

We are very happy to announce the upcoming second edition of ModSecurity Handbook! Christian Folini has worked for many months to update the material, which now covers ModSecurity versions up to 2.9.1. MORE »

New Security Course: Internet PKI in Depth
7 November 2016

Latest training available from Feisty Duck: Spend a full day to understand both the theory and practice of Internet PKI. By the end of the day you will have built a fully-functioning private CA—with multiple intermediate CAs and revocation—using a method that you can easily replicate.  MORE »

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.