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What is KSN Number?
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What is Ksn key?
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.
What is KSN in DUKPT?
24-1, DUKPT uses a 10-byte KSN, most often represented as a sequence of 20 hexadecimal characters in which each byte of the KSN is represented by a pair of hexadecimal characters. The general format of the KSN is as follows: Right-most 21 bits: Transaction counter for each successively derived key.
What is base derivation key?
Essentially, one Base Derivation Key (BDK) is used to initiate the DUKPT process. The BDK itself is never exposed, but instead is used to create another key, called an initial key. Through derivation, DUKPT forms a self-recycling system that promotes security, efficiency, and ease of implementation.
How many bits are in a KSN transaction counter?
KSNs have 3 components: a 21 bits transaction counter and remaining bits are for key set ID and Tamper Resistant Security Module (TRSM) ID. For an 8 byte KSN the typical convention is 24 bits for key set ID and 19 bits for TRSM ID. This means around 16M Base Derivation Keys (BDKs) and 500K devices. To me this allocation has pros and cons.
How many base derivation keys does an 8 byte KSN have?
For an 8 byte KSN the typical convention is 24 bits for key set ID and 19 bits for TRSM ID. This means around 16M Base Derivation Keys (BDKs) and 500K devices. To me this allocation has pros and cons. The cons are that I will never have 16M BDKs and if the business is successful it is quite possible to have > 500K devices.
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.
Where does the KSN pair come from on a device?
The KSN is formed from the device’s unique identifier, and an internal transaction counter. The (cryptogram, KSN) pair is forwarded on to the intended recipient, typically the merchant acquirer, where it is decrypted and processed further.
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