The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 07, 2000
Filed:
Jun. 30, 1997
Ronald M Smith, Sr, Wappingers Falls, NY (US);
Edward J D'Avignon, Kingston, NY (US);
Robert S DeBellis, Raleigh, NC (US);
Phil Chi-Chung Yeh, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Objects such as master keys or object protection keys that are kept in a protected environment of a crypto module are securely transferred between modules by means of transport keys. The transport keys are generated by public key procedures and are inaccessible outside the modules. Master keys are encrypted under the transport key within the protected environment of the source module, transmitted in encrypted form to the target module, and decrypted with the transport key within the protected environment of the target module. Object protection keys that are encrypted under a first master key kept in the protected environment of the source module are decrypted with the first master within the protected environment of the source module before being encrypted under the transport key. The object protection keys are encrypted under a second master key within the protected environment of the target module after being decrypted with the transport key. The procedure is secure since the transport key, the master keys and the object protection keys are never made available outside the protected environments of the crypto modules.