Which term is a block of data used to encapsulate a PIN during processing?

• A. PIN Entry Device
• B. POI
• C. PIN Block
• D. Policy

Answer: (C)

The PIN block is the data container that encapsulates the PIN during processing. When a PIN is entered at a PIN Entry Device, the device creates a PIN Block by formatting the PIN (and typically incorporating part of the account number) and encrypting it with a cryptographic key. This PIN Block then travels to the processor or issuer, keeping the PIN protected in transit and at rest. The other terms refer to hardware or policy concepts, not to the data structure used to carry the PIN: a PIN Entry Device is the hardware you type into, POI is the broader category of point-of-interaction devices, and a policy is a set of rules, not a data block.