The Root Of TrustBlog
Payments and security, explained the way you'd explain it to a smart friend over coffee. HSMs, keys, PINs, PCI, and what's coming next.
-
Visa's Trusted Agent Protocol Explained
How a store knows a real, approved agent is behind a request, and not a script pretending to be one.
-
Mastercard's Agent Pay Explained
Once you know an agent is real, the next question is what it can spend. How Agent Pay caps it, and why the network enforces the limits rather than the agent.
-
Google's AP2 Explained
Knowing an agent is real and capped still leaves one question. Did you agree to this exact order? How AP2 locks down the specific purchase.
-
How Card Personalization Works
How a blank piece of plastic becomes your card. The six steps an issuer prepares, what the HSM really does, and where middleware and cloud services fit in.
-
NIST PQC Algorithms, Explained
ML-KEM, ML-DSA, and SLH-DSA in plain English, why RSA and ECC worked in the first place, why quantum computers change the math, and what each new algorithm actually replaces.
-
What's Actually Inside a Key Block?
Key Usage, Algorithm, Mode of Use, and the other header fields inside a TR-31 key block, what each one enforces, and why binding the header to the key is the real innovation.
-
HSM vs. Software-Based Key Management
When do you actually need a dedicated hardware security module, and when is a software vault good enough? A practical framework for making the call, and where most teams actually land.
-
How HSMs Organize Keys: The Key Hierarchy
LMK, ZMK, TMK, BDK, DUKPT and the rest of the HSM key hierarchy, how one master key born inside the hardware quietly protects every other key in a payment.
-
Key Block Formats Explained
TR-31, TR-34, Atalla and Thales key blocks compared side by side: what they are, how they differ, and where they live in a payment transaction.
-
ECC vs. RSA: What's the Difference?
Smaller keys, same strength. How elliptic curves sign and agree on secrets, where they run in payments, and a quick guide to the curves you'll meet.
-
RSA, Explained Simply
Two keys, one mailbox, and the three jobs RSA quietly does in payments. Plus why quantum computers hit key transport harder than signatures.
-
Encryption Modes, Demystified
ECB, CBC, CTR, GCM and friends in plain English, plus where they quietly show up in PIN blocks, key check values, TR-31 and DUKPT.