Sebastien Rousseau
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Sebastien Rousseau

Articles on AI, post-quantum cryptography, ISO 20022 and the future of payments.

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Post-Quantum Cryptography

Lattice-based cryptography, NIST PQC standards, quantum-safe payments, and the harvest-now-decrypt-later threat. Research notes, open-source libraries, and migration playbooks for financial-services security teams.

Quantum-safe cryptography migration map for 2026 showing NIST PQC standards, hybrid protocol work, QKD assurance, crypto-agility, and bank data-risk tiers
Quantum Cryptography 2026 · Post-Quantum Cryptography · Nist Fips 203

The Quantum Cryptography Reset in 2026: PQC Standards, QKD Assurance, and the Migration Work Banks Cannot Defer

· Sebastien Rousseau

Quantum cryptography in 2026 is no longer a debate about whether quantum computers are imminent. It is a migration programme across post-quantum cryptography, crypto-agility, quantum key distribution assurance, protocol standards, supplier readiness, and long-lived financial data that is already exposed to harvest-now-decrypt-later risk.

Post-quantum cryptography migration roadmap diagram — corporate banking infrastructure transitioning from RSA to ML-KEM and ML-DSA
Post-Quantum Cryptography · Pqc Migration · Corporate Banking

Securing the Ledger: A Board-Level Guide to Post-Quantum Migration for Corporate Finance

· Sebastien Rousseau

Quantum risk has moved from research curiosity to active regulatory mandate. With the G7 roadmap published in January 2026, the EU, UK, and ASD timelines clarified, and the BIS Project Leap proving feasibility at the central-bank level, the question for boards is no longer whether to migrate — it is whether the migration can be completed before the cryptographic shelf-life of today's data expires.

Shor's algorithm qubit threshold diagram. Quantum computing circuit board with blue light patterns
Quantum Computing · Shor'S Algorithm · 10000 Qubits

Quantum Thresholds Are Moving: 10,000-Qubit Shor Risk

· Sebastien Rousseau

Shor's algorithm may now run on as few as 10,000 qubits. RSA, ECC and the timeline for post-quantum migration are all moving up. Here's why.

Quantum computing circuit board in blue light
Quantum-Safe Payments · Post-Quantum Cryptography · Sepa

Quantum-Safe Payments: Why the Industry Must Act Now

· Sebastien Rousseau

Quantum computing threatens payment system cryptography. The EPAA white paper outlines the structural risk and the urgent case for PQC migration.

Image generated using MidJourney - A Network of digital nodes in red and blue hues.
Post-Quantum Cryptography · Nist · Pqc Standardisation

Quantum Lattice Crypto: Bug in Chen's LWE Attack

· Sebastien Rousseau

A bug in Yilei Chen's quantum LWE algorithm temporarily reprieves lattice-based cryptography. What it means for CRYSTALS-Kyber, Dilithium and the PQC roadmap.

Banner of Network nodes in a digital blue space
Quantum Computing · Quantum Algorithm · Lattice Cryptography

Quantum Algorithm Challenges Lattice-Based Cryptography

· Sebastien Rousseau

A new polynomial-time quantum algorithm by Yilei Chen targets lattice-based cryptography. Implications for post-quantum standards including CRYSTALS-Kyber.

Banner for the Fully Homomorphic Encryption
Fully Homomorphic Encryption · Banking Security · Quantum Computing

Fully Homomorphic Encryption (FHE) in a Banking Quantum Era

· Sebastien Rousseau

Explore how Fully Homomorphic Encryption revolutionises data security in Banking and the Financial Industry, ensuring privacy against quantum computing threats.

Revolutionising Finance with AI-Enhanced Quantum Algorithms
Quantum Computing · Ai Algorithms · Financial Mathematics

Revolutionising Finance with AI-Enhanced Quantum Algorithms

· Sebastien Rousseau

Explore the transformative role of AI in quantum algorithms for finance, with a focus on their mathematical intricacies and banking applications.

State of AI and Quantum Computing in Banking: A 2023 Review
Ai In Banking · Quantum Computing · Financial Technology

State of AI and Quantum Computing in Banking: A 2023 Review

· Sebastien Rousseau

Exploring 2023's Technological Landscape: AI & Quantum Computing Revolutionising Banking, Rising Open-Source Models, and Evolving Regulations & Governance

HSBC From the Docks
Quantum Key Distribution (Qkd) · Quantum Security · Banking

Quantum Key Distribution Revolutionising Security in Banking

· Sebastien Rousseau

As quantum computers pose a threat to traditional encryption methods, Quantum Key Distribution (QKD) emerges as a game-changer, offering unparalleled security.

Empowering Secure Communications in the Quantum Era with KyberLib
Kyberlib · Rust Crystals-Kyber · Post-Quantum Cryptography

KyberLib: Rust CRYSTALS-Kyber for Post-Quantum

· Sebastien Rousseau

A Robust and Quantum-Safe Cryptography Implementation of the CRYSTALS-Kyber Algorithm, to Protect Your Data from Quantum Threats and Cryptanalytic Attacks.

A modern, sleek quantum computer
Quantum Computing · Quantum-Resistant Cryptography · Crystals-Kyber

CRYSTALS-Kyber: The Safeguarding Algorithm in a Quantum Age

· Sebastien Rousseau

Discover how CRYSTALS-Kyber, a quantum-resistant cryptography algorithm, is revolutionising the world of cryptography and preparing us for the quantum era.

A creative illustration on Quantum computing theme
Quantum-Resistant Cryptography · Post-Quantum Cryptography · Hash Library

Protecting Data in the Quantum Age: The Hash Library (HSH)

· Sebastien Rousseau

HSH uses quantum-resistant cryptographic primitives to protect your data, ensuring its security even in the face of future quantum computing advances.