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Cryptographic Key Authentication in Communication System Disclosure Number: IPCOM000068943D
Original Publication Date: 1978-Mar-01
Included in the Prior Art Database: 2005-Feb-20

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Ehrsam, WF Matyas, SM Meyer, CH [+details]


This article describes a method of insuring the integrity of master cipher keys used in a communication system. Security in a communication system is concerned with the protection of messages transmitted between a host processor and terminals. In such systems, the host and terminal cryptographic devices are provided in small physically secure areas, permitting the respective master keys KMH and KMT to be stored in the clear. All other keys are stored in the system enciphered under the master keys KMH or KMT or under keys derived internally from the master key, e.g., KMH*, where KMH* is obtained by inverting the first and fifth bit in each byte of KMH.