I'm trying to understand the DUKPT (Derived Unique Key Per Transaction) system used for PIN devices, but I'm getting hung up on the IPEK. This blog post has an image where the sequence is: BDK ...
EMV(Chip) Cards - What's the point of having the chip card communicating directly to the authorising server? & Clarification of CDA in EMV
Ok I understand from my research that the Chip Card creates an AC Key(MasterKey+AccNumber) to communicate with the authorizing server securely (3DES key to have encrypted communication) but I don't ...