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What is an Ipek?
In cryptography, Derived Unique Key Per Transaction (DUKPT) is a key management scheme in which for every transaction, a unique key is used which is derived from a fixed key.
How does DUKPT work?
POS devices typically safeguard data using an encryption key generation method called DUKPT, or Derived Key Per Transaction. After the data is sent, the current key is used to create additional future keys, and then it is erased, removing any information about a previous transaction. Derived keys keep information safe.
What is 3des Dukpt?
Why is Triple DES a better encryption scheme than DUKPT (Derived Unique Key Per Transaction)? Triple DES, sometimes shortened further as TDES, increases the difficulty of cracking the encryption by applying three rounds of action: an encryption, a decryption and an encryption, each with independent keys.
How is the derived unique key used in DUKPT?
In DUKPT each device is still initialized with a distinct key, but all of the initialization keys of an entire family of devices are derived from a single key, the base derivation key (BDK). To decrypt encrypted messages from devices in the field, the recipient need only store the BDK.
What do you need to know about DUKPT encryption?
Here’s a basic outline of the technique: You’re given a Base Derivation Key (BDK), which you assign to a swiper (note that the same BDK can be assigned to multiple swipers). You’ll use the BDK along with the device’s own unique Key Serial Number (KSN) to generate an Initial PIN Encryption Key (IPEK) for the device.
How can I generate session key for DUKPT?
Then you can generate the Session Key given the IPEK and KSN: Which can be used to decrypt the cryptogram:
How long are key serial numbers in DUKPT?
Understanding Key Serial Numbers (KSN) in Derived Unique Key Per Transaction (DUKPT) I have a number of questions regarding Key Serial Numbers (KSNs) in DUKPT: KSNs are 8 – 10 bytes long. Older implementation are 8 bytes whereas newer ones are 10 bytes.