EMV choose crypto method between SDA/DDA/CDA



  • I'm a newbie in emv world.

    I'm trying to follow this flow: emv flow chart

    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?



  • I got it. You have to the AIP field as follows: enter image description here

    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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