| US 7,593,528 B2 | ||
| Managing device keys in cryptographic communication | ||
| Kohichi Kamijoh, Kanagawa-ken (Japan); and Masaharu Sakamoto, Kanagawa-ken (Japan) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Sep. 12, 2007, as Appl. No. 11/853,932. | ||
| Claims priority of application No. 2006-255183 (JP), filed on Sep. 21, 2006. | ||
| Prior Publication US 2008/0075291 A1, Mar. 27, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04L 9/12 (2006.01) | ||
| U.S. Cl. 380—45 [380/278; 380/279; 380/281] | 10 Claims |
| 1. A method for managing a device key for cryptographic communication, and for performing cryptographic communication between
a first communication apparatus and a second communication apparatus, comprising the steps of:
storing first device keys shared with the second communication apparatus in a memory;
generating a computed result as second device keys by performing a computation by passing the first device keys read from
the memory to a keyed one-way function; and
outputting the second device keys to the first communication apparatus in order to allow the first communication apparatus
and the second communication apparatus to make the cryptographic communication with each other by using second device keys,
and outputting the key of the one-way function to the first communication apparatus in order for the second communication
apparatus to receive the key.
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