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:
Jan. 18, 2011
Filed:
Oct. 16, 2007
Masamichi Tateoka, Higashimurayama, JP;
Tomonari Tanaka, Tokyo, JP;
Masamichi Tateoka, Higashimurayama, JP;
Tomonari Tanaka, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Solutions Corporation, Tokyo, JP;
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 B, B, . . . , Bn in the decryption of data D input from a user terminal, an encryption unit which creates n encrypted distributed keys E(B), E(B), . . . , E(Bn) using n distributed manager public keys P, P, . . . , Pn, and an encrypted data storage unit which stores encrypted data E(D), an encrypted data key E(K) and the n encrypted distributed keys in association with each other.