Feisty Duck

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The place for TLS and PKI education. Publishers of Bulletproof TLS and PKI. Authors of Practical TLS and PKI training. Monthly Bulletproof TLS Newsletter.
In today’s newsletter, we examine the current state of messaging encryption. At first, it seems that we’re on the right track, with many platforms claiming end-to-end encryption and even post-quantum computer safety. But, when we dig deeper, we uncover many implementation issues—such as interoperability and plaintext backups—as well as deeper structural issues that can cause the whole system to fall apart and regress to no encryption at all. Find the full article in the newsletter. https://www.feistyduck.com/newsletter/issue_134_messaging_encryption_has_come_a_long_way_but_falls_short?utm_source=mastodon&utm_medium=social
Cryptography & Security Newsletter is out! In this issue:
- Let’s Encrypt’s Six-Day Certificates Generally Available
- Short News
https://www.feistyduck.com/newsletter/issue_133_lets_encrypts_six_day_certificates_generally_available
Cryptography & Security Newsletter is out! In the December issue:
- OpenSSL Performance Still Under Scrutiny
- Short News
https://www.feistyduck.com/newsletter/issue_132_openssl_performance_still_under_scrutiny
Black Friday Discounts from Feisty Duck (No.3) - 50% off on ModSecurity Handbook (Ebook)! https://www.feistyduck.com/books/modsecurity-handbook?utm_source=mastodon_nov
Black Friday Discounts from Feisty Duck (No.2) - 10% off Practical TLS and PKI Training. Even on Early Bird tickets! From $1,485. One week only.
https://www.feistyduck.com/training/practical-tls-and-pki?utm_source=mastodon_nov
Black Friday Discounts from Feisty Duck (No.1) - 50% off on Bulletproof TLS and PKI (Ebook). Just for one week!
https://www.feistyduck.com/books/bulletproof-tls-and-pki?utm_source=mastodon_nov
Cryptography & Security Newsletter is out! In this issue:
- The Legend of Kipp Hickman
- Short News
https://www.feistyduck.com/newsletter/issue_131_the_legend_of_kipp_hickman?utm_source=mastodon_nov
New dates! Practical TLS and PKI Training - 23-26 Feb 2026. We have a limited number of Early Bird tickets available. From Ivan Ristic and with Scott Helme, based on Bulletproof TLS and PKI. https://www.feistyduck.com/training/practical-tls-and-pki
Cryptography & Security Newsletter is out! In the October issue:
Web PKI Ditches TLS Client Authentication
- How Many Public PKIs Are There?
- Impact on Certificate Transparency
Short News
https://www.feistyduck.com/newsletter/issue_130_web_pki_ditches_tls_client_authentication
Halloween Discount on Practical TLS and PKI Training! 🎃 $500 off on the final training of the year, Nov 10-13. For devs and sysadmins: how to deploy secure servers and design secure web applications
https://www.feistyduck.com/training/practical-tls-and-pki