# Building an AI-Resistant Post-Quantum VPN in Rust 🦀 (With an Open Crypto Challenge) > Source: > Published: 2026-06-14 20:17:55+00:00 Hello Dev.to! 👋 I'm the architect of an experimental post-quantum VPN protocol called **QCRA** (Quantum-Chess Routing Architecture). It’s written entirely in Rust (250K+ lines, 46 passing test suites). Today, I’m open-sourcing the protocol specification along with a **Cryptographic Open Challenge** for anyone who wants to try and break the math. The standard approach to post-quantum networking today is to take **ML-KEM** (Kyber), wrap it in a TLS-like handshake, and call it a day. While this protects against Shor's algorithm on future quantum computers, it ignores an entirely different, very modern threat vector: **AI-Driven Traffic Analysis**. Modern machine learning classifiers can identify encrypted VPN traffic with >99% accuracy. They don't need to decrypt your packets; they exploit statistical discontinuities, packet timing, and size patterns. Most key derivation functions operate in standard Euclidean space. I moved the key evolution into **p-adic space** (specifically using the prime `p=104729` ). Because p-adic numbers use the *ultrametric inequality* instead of the triangle inequality, distances behave completely differently. **Gradient-descent-based ML attacks cannot define a meaningful continuous loss function** over this key space. The AI literally cannot converge on a pattern. Instead of flat KDF chains, the key state in QCRA lives on the **SO(3) manifold** (the 3D rotation group). Evolution uses quaternion SLERP (Spherical Linear Interpolation) along geodesics. By utilizing a 6D continuous representation (Zhou et al. 2019), we eliminate the statistical discontinuities that AI classifiers usually exploit to fingerprint traffic. I know that "novel cryptography" is usually a huge red flag. The #1 rule of applied cryptography is *Don't roll your own crypto*. That is exactly why I am putting this out here. I want the hardest scrutiny from the community before making any production claims. The protocol is currently at TRL-4 (lab-validated). **I've published a challenge repository containing:** `ciphertexts.hex` file?