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Key handling with control vectors

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1 Author(s)
S. M. Matyas ; IBM Federal Sector Division, 9500 Godwin Drive, Manassas, Virginia 22110, USA

A method is presented for controlling cryptographic key usage based on control vectors. Each cryptographic key has an associated control vector that defines the permitted uses of the key within the cryptographic system. At key generation, the control vector is cryptographically coupled to the key via a special encryption process. Each encrypted key and control vector is stored and distributed within the cryptographic system as a single token. Decryption of a key requires respecification of the control vector. As part of the decryption process, the cryptographic hardware also verifies that the requested use of the key is authorized by the control vector. This paper focuses mainly on the use of control vectors in cryptosystems based on the Data Encryption Algorithm.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Systems Journal  (Volume:30 ,  Issue: 2 )