Sebastien Rousseau
Àwòrán Sebastien Rousseau

Sebastien Rousseau

Dídáàbò bo ọjọ́ọjọ́ ifowopamọ́
pẹ̀lú àkànpọ̀ AI
àti ìfọ̀rọ̀-ìkọ̀kọ̀ lẹ́yìn-quantum.

A kọ́ ọ́ fún edge. A ṣe e fún ìfaradà tí kò ní ìbámu. Ń ru ìran tókàn ti ìsanwó kárí ayé sókè.

For decision makers

Where this work shows up
on the balance sheet.

The open-source libraries below aren’t research curios. Each one maps to a board-level risk a Tier-1 bank is being asked to evidence under DORA, BCBS 239, Basel III or NIST CSF 2.0 — and shaves real cost off the audit trail that satisfies the regulator.

Compliance

DORA Article 5 & BCBS 239 evidence

Lossless parsing, signed releases and structured ISO 20022 outputs mean the configuration and payment files that move money are auditable end-to-end. Less to defend in your next supervisory exam.

See the case studies ›

Cost reduction

Open source over proprietary licensing

Apache-2.0 / MIT replaces six- and seven-figure vendor contracts on pain.001 generation, statement parsing and edge security tooling. Audit-grade quality without the per-seat fee.

Browse the projects ›

Strategic hedging

Post-quantum cryptography readiness

KyberLib gives your team an inspectable, NIST FIPS 203-aligned implementation of ML-KEM today — ready for the SWIFT structured-address cutover and the longer harvest-now-decrypt-later horizon.

Read the research ›

Authored & maintained

Open source for the
future of finance.

A portfolio of Python, Rust and JavaScript libraries I created and maintain. Open source, free to use, and applied to wholesale payments, cross-border settlement, financial data and quantum-resistant cryptography.

pain001 logo. Open-source ISO 20022 payment file automation by Sebastien Rousseau
Python · Payments

pain001

Ìṣòro
Kíkọ ISO 20022 pain.001 pẹ̀lú ọwọ́ jẹ́ ewu nígbà tí SEPA àti SWIFT bá yí padà.
Ọ̀nà Àbájáde
Python tí ó gbára lé ìlànà tí ó ń yí CSV tàbí SQLite padà sí XML ìsanwó tí a ti ṣàyẹ̀wò.
Àbájáde
Àwọn ẹgbẹ́ iṣẹ́ ń pín pain.001 jáde ní ìṣẹ́jú díẹ̀; ìrékọjá ìgbẹ́kẹ̀lé gbé ayẹ̀wò ìgbékalẹ̀ já.

Ipa ISO 20022 · SEPA + SWIFT

Learn about pain001

4116Apache-2.0last commit 2mo ago

pacs008 logo. Open-source ISO 20022 pacs.008 toolkit by Sebastien Rousseau
Python · Cross-border

pacs008

Ìṣòro
Gbigbe owó láti ilé-iṣẹ́ ìfowópamọ́ sí ilé-iṣẹ́ mìíràn kúnfò ayẹ̀wò nígbà tí XSD, IBAN àti àwọn òfin PII bá yàtọ̀.
Ọ̀nà Àbájáde
Ìwé-ìkàwé kan ṣoṣo: JSON Schema, XSD, IBAN káàkiri orílẹ̀-èdè 75, ifarakoko tó dọ́gba pẹ̀lú GDPR.
Àbájáde
Gbigbe owó l'áàgbélé àgbáyé tí ó kọjá ìgbàdánwò àkọ́kọ́ níwájú àwọn alárégbèéfà.

Ipa Orílẹ̀-èdè 75 · IBAN

Learn about pacs008

2Apache-2.0last commit 2mo ago

Bank Statement Parser logo. Open-source finance toolkit by Sebastien Rousseau
Python · Finance

Bank Statement Parser

Ìṣòro
Àwọn ìpínlẹ̀ àkọ́sílẹ̀ ń di àwọn ẹgbẹ́ isọdi-owó mọ́ nínú tíì ọwọ́ fọn tún.
Ọ̀nà Àbájáde
Àpòpọ̀ irinṣẹ́ Python kan tí ó ṣe àdéédé àwọn àkọ́sílẹ̀ onírúurú ìpínlẹ̀ pẹ̀lú ẹsẹ ìrékọjá tí ó dọ́gba pẹ̀lú ayẹ̀wò.
Àbájáde
Isọdi-owó ń ṣiṣẹ́ láìsí kóòdù àkànṣe fún olùfowópamọ́ kọ̀ọ̀kan.

Ipa Onírúurú ìpínlẹ̀ · Dọ́gba-ayẹ̀wò

Learn about Bank Statement Parser

215Apache-2.0last commit 1mo ago

Hash HSH logo. Open-source Rust hash library by Sebastien Rousseau
Rust · Security

Hash (HSH)

Ìṣòro
Àwọn ìwé-ìkàwé hashing tó ṣíwájú PQC fi àwọn ibi ìpamọ́ àṣírí sílẹ̀ gẹ́gẹ́ bí ohun tí ìmọ̀-ẹ̀rọ kuatomu lè gbógun ti.
Ọ̀nà Àbájáde
Ìwé-ìkàwé hash àti digest Rust tó ní ààbò ìrántí pẹ̀lú ìdúró post-quantum.
Àbájáde
Hashing ààbò tó rọ́rùn láti fi dípò èkejì fún àwọn iṣẹ́ tó ń gbèrò lọ ní PQC.

Ipa Ìrántí-ààbò · Rust

Learn about HSH

201Apache-2.0last commit 4mo ago

KyberLib logo. Open-source Rust CRYSTALS-Kyber library by Sebastien Rousseau
Rust · Quantum

KyberLib

Ìṣòro
Àwọn ilé-iṣẹ́ ìfowópamọ́ Tier-1 ní ewu harvest-now-decrypt-later lórí gbogbo ìpínyà TLS.
Ọ̀nà Àbájáde
CRYSTALS-Kyber Rust tó mọ́ (NIST FIPS 203) tí ó ń wọ inú àwọn ṣíṣàn ìdánimọ̀ tó wà tẹ́lẹ̀.
Àbájáde
Pàṣípààrọ̀ kọ́kọ́rọ́ post-quantum nínú Rust tó dọ́gba pẹ̀lú ìṣelọpọ́, tí a ti ṣàyẹ̀wò ní àìgbára.

Ipa NIST FIPS 203

Learn about KyberLib

413last commit 4mo ago

noyalib logo. Open-source pure-Rust YAML 1.2 ecosystem by Sebastien Rousseau
Rust · YAML

noyalib

Ìṣòro
AI, MCP àti àwọn ìṣàn ìtúpalẹ̀ ń ṣiṣẹ́ lórí àwọn àtúpalẹ̀ YAML tó ní UB tó gbára lé C àti ìyípadà àpẹẹrẹ tó farasin.
Ọ̀nà Àbájáde
YAML 1.2 Rust tó mọ́ káàkiri ìwé-ìkàwé, CLI, LSP, MCP àti WASM — zero unsafe, àpẹẹrẹ kíkún.
Àbájáde
Àwọn ìṣàn YAML tí ó dáwọ́ jẹ́ ọ̀nà àìlágbára nínú ìgbọràn ẹ̀rọ-ìpèsè.

Ipa 406 / 406 àpẹẹrẹ · 0 unsafe

Learn about noyalib

1Apache-2.0last commit 1mo ago

“Quantum computing threatens the cryptographic foundations of financial services. Payments, from real-time to cross-border settlement, rely on protections that quantum computing will eventually render obsolete.”

Emerging Payments Association Asia (EPAA) · septembre 2025

Quantum-Safe Payments.

Industry white paper for the Emerging Payments Association Asia. The structural threat quantum computing poses to payment infrastructure, and the case for coordinated action now.

Banner illustration for the EPAA Quantum-Safe Payments white paper

EPAA · septembre 2025

Why the payments industry must act now.

Regulators are treating harvest-now-decrypt-later as a credible present risk. This paper outlines the structural threat and the urgent case for coordinated action across wholesale payment rails.

Read the white paper

Ka ìwádìí tuntun

From the desk.

Recent research and writing on quantum-safe cryptography, ISO 20022 migration and the future of wholesale payments.

Close-up of a developer terminal scrolling Rust compiler output — the visible discipline of a memory-safe, audit-able cryptographic substrate beneath an enterprise banking authentication estate
Hsh · Rust · Báńkì

Dída Ìṣàkóso Ọ̀rọ̀-ìgbàláàyè Bo ní Báńkì Ilé-iṣẹ́: Hashing Aláwọ̀n-méjì àti Àwọn Ìgbéga pẹ̀lú hsh

TL;DR hsh jẹ́ ìpilẹ̀ cryptographic Rust mímọ́ tó ń jẹ́ kí àwọn báńkì tier-1 ṣíkiri àwọn hash ọ̀rọ̀-ìgbàláàyè ìbílẹ̀ sí Argon2id láìní àkókò ìdúró, pẹ̀lú peppering HSM àti yíyọ àwọn àìlera ìrántí FFI ti C kúrò láti tẹ́ àwọn àṣẹ resilience DORA lọ́rùn.

Experience

Brands along the way.

From global Tier-1 banks to consumer technology. Payments and digital product leadership across HSBC, PayPal, Barclays, Shazam, AKQA and Virgin Group.