Cryptography – Key management – Key distribution
Reexamination Certificate
2011-01-18
2011-01-18
Gergiso, Techane J (Department: 2437)
Cryptography
Key management
Key distribution
C380S259000
Reexamination Certificate
active
07873168
ABSTRACT:
In a secret information management system, a secret information management apparatus comprises a secret distribution unit which secretly distributes a data key k using a (k, n) threshold secret sharing scheme and creates n distributed keys B1, B2, . . . , Bn in the decryption of data D input from a user terminal, an encryption unit which creates n encrypted distributed keys EP1(B1), EP2(B2), . . . , EPn(Bn) using n distributed manager public keys P1, P2, . . . , Pn, and an encrypted data storage unit which stores encrypted data EK(D), an encrypted data key EPx(K) and the n encrypted distributed keys in association with each other.
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Decision of Rejection mailed Jan. 26, 2010, from the Japanese Patent Office in corresponding Japanese application No. 2006-284087.
Notification of Reason for Rejection issued by the Japanese Patent Office on Oct. 21, 2008, for Japanese Patent Application No. 2006-284087, and English-language translation thereof.
Tanaka Tomonari
Tateoka Masamichi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Gergiso Techane J
Kabushiki Kaisha Toshiba
Toshiba Solutions Corporation
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