Question 1

What is DUKPT AES?

Accepted Answer

DUKPT AES is an extension of the original DUKPT (Derived Unique Key Per Transaction) standard that adds support for AES encryption algorithms (AES-128, AES-192, AES-256) in addition to traditional TDEA (Triple DES).

Question 2

What key types are supported?

Accepted Answer

DUKPT AES supports 2TDEA (16-byte keys), 3TDEA (24-byte keys), AES-128 (16-byte keys), AES-192 (24-byte keys), and AES-256 (32-byte keys). Each provides different levels of security and performance.

Question 3

What is the difference between BDK and IK?

Accepted Answer

BDK (Base Derivation Key) is the root key used by key injection facilities. IK (Initial Key) is the first derived key loaded into a device. Both can be used as starting points for DUKPT key derivation.

Question 4

Why use AES instead of TDEA?

Accepted Answer

AES offers stronger security, better performance, and is the modern encryption standard. AES-128 provides equivalent security to 3TDEA but with better speed. AES-256 provides even stronger protection for highly sensitive data.

Question 5

What is the KSN format?

Accepted Answer

KSN (Key Serial Number) is a 12-byte (24 hex characters) value that includes the device serial number and a transaction counter. It ensures each transaction uses a unique derived key.

DUKPT (AES)

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