Method and Server for Providing Transaction Keys

Abstract

A method and a server for providing transaction keys for a transaction system includes transaction units which use pre-delivered transaction keys, and 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 of deriving a key from the master key and a second sub step of deriving the transaction key from the derived key. The first sub step or the second sub step of deriving is performed dependent on a security level of the transaction unit.

Dependencies are inferred from the claim text.