METHOD AND SERVER FOR PROVIDING TRANSACTION KEYS

摘要

A method and a server for providing transaction keys for a transaction system are improved. Transaction units of the transaction system use predelivered transaction keys, which are provided by a key provisioning server and wherein the transaction key usage is checked by a transaction checking server. A transaction key is derived from a master key of a transaction unit, wherein a varying derivation parameter is used in the step of deriving. The step of deriving comprises a first sub step (12) of deriving a key from the master key and a second sub step (14) of deriving the transaction key from the derived key. The first sub step (12) or the second sub step (14) of deriving is performed dependent on a security level of the transaction unit.