Sebastien Rousseau
Black and White Portrait of Sebastien Rousseau

Sebastien Rousseau

Securing the future of banking
with agentic AI
and post-quantum cryptography.

Open-source payments, post-quantum security, and applied AI for financial services.

Soft natural light over a modern architectural space, representing dependable financial infrastructure.

What I build

Open source for the future of finance.

Payments

ISO 20022, end to end: pain.001, pacs.008, camt.053, and acmt.001. Adopt one library at a time.

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Security

Post-quantum primitives: ML-KEM (CRYSTALS-Kyber, NIST FIPS 203) and hashing, ready to pilot today.

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Tooling

Audited Rust libraries and a code security scanner, signed and shipped with a software bill of materials.

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Proof

By the numbers.

37.1MOpen-source downloads
663GitHub stars
84Sigstore-signed articles
19Years in payments and banking
Isometric render of an illuminated processor, representing the cryptographic foundations of payments.

EPAA · September 2025

Why the payments industry must act now.

Regulators are treating harvest-now-decrypt-later as a credible present risk. This paper, produced for the Emerging Payments Association Asia, sets out the structural threat and the case for coordinated action across wholesale payment rails.

Read the white paper

Latest

From the desk.

Abstract horizon of converging signal lines — AI, synthetic media, and programmable-money rails resolving over a banking skyline, evoking a supervisory scan of emerging-technology risk for financial services in 2026
Emerging Technology · Horizon Scanning · FCA

Reading the Emerging-Technology Risk Horizon for Banks in 2026

TL;DR An original reading of the 2026 emerging-technology risk horizon for banks — personalised AI intelligence, synthetic financial crime, and programmable finance — with a signal-to-supervision framework, drawing on the FCA's Technology Horizon Scan 2026.