Sichere Schlüsselverwaltung unter Verwendung einer Steuervektorumwandlung

摘要

A cryptographic system and method is provided which accepts a key K encrypted under a key formed by exclusive-ORing a key-encrypting key KK with a first control vector C5 and outputs the same key K encrypted under a key formed by exclusive-ORing KK with a second control vector C6. The set (C5, C6) represents a mapping of the type and usage of the key K defined by the control vector C5 to the type and usage defined by the control vector C6. The set of allowable control vector mappings, that is from C5 to C6, are defined in a control vector translation table (50), which is specified in advance by authorized installation personnel.