Signed Dynamic Application Data

What it is

Card signature over dynamic data produced for DDADynamic Data AuthenticationOffline check where the card signs unique, per-transaction data with its own private key — proving the chip is genuine and not a clone.View in glossary →/CDACombined DDA / Application Cryptogram generationThe strongest offline authentication: the card signs the dynamic data and the transaction cryptogram together in one step, preventing tamper (“wedge”) attacks.View in glossary →.

Specification reference

Defined in: EMV 4.x Book 3 (Application Specification), Annex A — Data Element Dictionary

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