Patent application number | Description | Published |
20080232580 | SECRET SHARING APPARATUS, METHOD, AND PROGRAM - A secret sharing apparatus according to the present invention is based on a (k,n)-threshold scheme with a threshold of at least 4. The secret sharing apparatus generates a generator matrix (G) of GF( | 09-25-2008 |
20080304661 | CONTENT DISTRIBUTION/BROWSING SYSTEM, CONTENT DISTRIBUTION APPARATUS, CONTENT BROWSING APPARATUS AND PROGRAM - A content distribution/browsing system is disclosed. First to (m−1)th encrypted content items E(K | 12-11-2008 |
20090019279 | USER APPARATUS AND PROGRAM - A user apparatus cannot acquire as many distribution keys K | 01-15-2009 |
20090049147 | RECIPIENT APPARATUS, FILE SERVER APPARATUS AND PROGRAM - A recipient apparatus and a file server apparatus respectively receive shared mails which are generated by performing secret sharing of an electronic mail from a sender apparatus by a mail server apparatus. The file server apparatus authenticates the recipient apparatus based on an account and transmits shared data to the recipient apparatus when authentication is successful. The recipient apparatus restores the electronic mail with the shared data and shared data in the shared mail which is previously received. | 02-19-2009 |
20090144543 | SECRET SHARING DEVICE, METHOD, AND PROGRAM - A secret sharing device of (k, n) threshold scheme creates a generator matrix G, first divided secret data, and random number data, calculates shared partial data based on the product of matrices with the random number data, the divided secret data, and the generator matrix G, and delivers the shared information formed by the shared partial data and the header information individually to the storage units. The secret sharing device calculates a recovery matrix and multiplies the shared information by the recovery matrix, hence to recover the secret information. | 06-04-2009 |