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The key type encrypted using DUKPT from a Base Derivation Key (BDK) and Key Serial Number (KSN). This must be less than or equal to the strength of the BDK. For example, you can't use AES_128 as a derivation type for a BDK of AES_128 or TDES_2KEY

The type of use of DUKPT, which can be incoming data decryption, outgoing data encryption, or both.

An input to cryptographic primitive used to provide the intial state. Typically the InitializationVector must have a random or psuedo-random value, but sometimes it only needs to be unpredictable or unique. If you don't provide a value, Amazon Web Services Payment Cryptography generates a random value.

The unique identifier known as Key Serial Number (KSN) that comes from an encrypting device using DUKPT encryption method. The KSN is derived from the encrypting device unique identifier and an internal transaction counter.

The block cipher mode of operation. Block ciphers are designed to encrypt a block of data of fixed size, for example, 128 bits. The size of the input block is usually same as the size of the encrypted output block, while the key length can be different. A mode of operation describes how to repeatedly apply a cipher's single-block operation to securely transform amounts of data larger than a block.