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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.:

US 8619980 B1

PDFFull Text
Date of Patent:
Dec. 31, 2013

Filed:

Apr. 23, 2010

Information generation apparatus, method, program, and recording medium for deriving a decryption key from another decryption key

Applicants:

Koutarou Suzuki, Tokyo, JP;

Ryo Nishimaki, Tokyo, JP;

Inventors:

Koutarou Suzuki, Tokyo, JP;

Ryo Nishimaki, Tokyo, JP;

Assignee:

Nippon Telegraph and Telephone Corporation, Tokyo, JP;

Attorney:

Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Aravind Moorthy

Int. Cl.
CPC ...
H04L 9/00 (2006.01); H04K 1/00 (2006.01); H04L 9/28 (2006.01); H04L 29/06 (2006.01); H04L 9/32 (2006.01);
U.S. Cl.
CPC ...
Abstract

Hierarchical cryptography expressed in a general semiordered structure other than a tree structure is implemented. In information generation, random numbers σand (σ)εZare generated; main information k=σΣvb*+b* is calculated; and derivation information k=σΣvb*+b* is calculated for each jεw(v). In information derivation, random numbers σand (σ)εZare generated; main information k=σΣuk+kis calculated; and derivation information k=σΣuk+kis calculated for each jεw(v).

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Suzuki, Koutarou. (2013). Information generation apparatus, method, program, and recording medium for deriving a decryption key from another decryption key (U.S. Patent No. 8619980). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8619980

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