Card data
How to read an EMV TLV response
Separate tags, lengths and values, then inspect a small nested response in CardGroove.
Read article : How to read an EMV TLV responseA closer look.
One guide at a time.
Practical notes on card data, cryptography and getting useful answers from your tools.
Testing workflows
Test a crypto calculation with a known vector
A repeatable way to check keys, encodings, padding and expected outputs before troubleshooting an integration.
Read article : Test a crypto calculation with a known vectorKey management
What does a key check value tell you?
Use KCVs to compare test keys, understand method differences and avoid treating a short check value as proof.
Read article : What does a key check value tell you?