Corebaseit

I’m Vincent Bevia — I work on payments at Multisafepay (part of Ant Group), and I’ve spent years in POS architecture, EMV, and cryptography. I wrote Point-of-Sale Systems Architecture — Volume 1 and The Obsolescence Paradox: Why the Best Engineers Will Thrive in the AI Era.
This blog is my space to share what I’m thinking about, learning, or discussing: POS systems, EMV, SoftPOS, payment security, and increasingly — how AI is reshaping this space. Less corporate, more personal. Opinions, reflections, and the kind of stuff I’d talk about over coffee.
Topics I care about:
POS & EMV — how terminals, chips, and contactless actually work
Cryptography & security — DUKPT, HSMs, key management in the real world
AI in payments — where it helps, where it doesn’t, and what’s coming
If you’re building payment tech or just curious how it all fits together, welcome — let’s discuss.

AI POS Security

Prompt Engineering for POS: Treating LLM Inputs as First-Class Architecture

Cryptography Security POS

DUKPT Key Derivation: Technical Reference for POS Systems

Security POS Cryptography

PIN Translation: Bridging Cryptographic Worlds Inside the HSM

Security POS Cryptography

EMV Cryptograms: How ARQC Prevents Fraud

Cryptography Security

RSA Algorithm: Theory and Implementation

Nexo Protocol Adoption in Modern SmartPOS Architectures

Types of POS Terminals and Where They Fit

Cryptography Security POS

IPEK Derivation & Terminal Key Injection

Track 2 Data — Technical Overview (and Why It's Slowly Disappearing)

EMV for Developers: What You Really Need to Know