P4 The HSM

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Lesson P4: What stays inside the HSM, and the commands a host sends to translate and verify PINs, MACs and cryptograms.

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The opening of the lesson

Why it matters

A hardware security module is where a payment system's secrets live and where every sensitive operation happens:

PIN translation and verification;
MAC generation and checking;
cryptogram verification;
key import and export.

Host developers write code that calls it; testers read its error codes; auditors check its configuration. If a key or a PIN ever appears in clear outside an HSM, something is wrong.

In the full lesson

The concept
In the real world
Common mistakes
What to test

What module P4 covers →

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