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Dhole Moments, Soa Talks, and Other Bad Puns…

What We Do in the /etc/shadow – Cryptography with Passwords

Ever since the famous “Open Sesame” line from One Thousand and One Nights, humanity was doomed to suffer from the scourge of passwords. Even in a world where we use hardware tokens with asymmetric cryptography to obviate the need for passwords in modern authentication protocols, we’ll still need to include “something you know” for legal…

Extending the AES-GCM Nonce Without Nightmare Fuel

When it comes to AES-GCM, I am not a fan. Most of my gripes fall into one of two categories: However, one of my gripes technically belongs in both categories: The small nonce size, which is caused by AES’s block size, limits the amount of data you can safely encrypt with a single symmetric key.…

Towards End-to-End Encryption for Direct Messages in the Fediverse

As Twitter’s new management continues to nosedive the platform directly into the ground, many people are migrating to what seem like drop-in alternatives; i.e. Cohost and Mastodon. Some are even considering new platforms that none of us have heard of before (one is called “Hive”). Needless to say, these are somewhat chaotic times. One topic…

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