EMV choose crypto method between SDA/DDA/CDA
I'm a newbie in emv world.
I'm trying to follow this flow:
I'm in the third step. I have to manage the Offline Data Authentication.
How can I negotiate the correct way (SDA, DDA or CDA) with the ICC to perform offline auth?
Solution
I got it.
You have to the AIP field as follows:
To retrieve the AIP, according to "EMV Book 3 - Application Specification", use te Tag 0x80 Format 1 reply for GET PROCESSING OPTIONS contained:
x82: Application Interchange Profile (AIP),
x94: Application File Locator (AFL).
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