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Latest posts

Last updated about 2 months ago

Accumulated Test Vectors

about 2 months ago

I like tests. I especially like reusable test vector libraries. Sometimes test...

The FIPS Compliance of HKDF

2 months ago

HKDF is an HMAC-based key-derivation function specified in RFC 5869. It’s nice...

Let’s All Agree to Use Seeds as ML-KEM Keys

3 months ago

Last week, NIST published the final version of the ML-KEM[1] specification, FIPS...

age Plugins

4 months ago

age is a file encryption tool, library, and format. It lets you...

Geomys, a blueprint for a sustainable open source maintenance firm

5 months ago

In 2022, I left Google in search of a sustainable approach to...

XAES-256-GCM

5 months ago

About a year ago I wrote that “I want to use XAES-256-GCM/11...

My Maintenance Policy

8 months ago

I wrote a short document describing how I maintain open source projects...

PINs for Cryptography with Hardware Secure Elements

10 months ago

I’m a big fan of technologies that enable otherwise impossible security properties...

Post-quantum Cryptography for the Go Ecosystem

10 months ago

filippo.io/mlkem768 is a pure-Go implementation of ML-KEM-768 optimized for correctness and readability...

Enough Polynomials and Linear Algebra to Implement Kyber

about 1 year ago

I was once talking with a mathematician and trying to explain elliptic...

Why We Don’t Generate Elliptic Curves Every Day

about 1 year ago

With all the talk recently of how the NIST curve parameters were...

Announcing the $12k NIST Elliptic Curves Seeds Bounty

about 1 year ago

The NIST elliptic curves that power much of modern cryptography were generated...