DATA ENCRYPTION STORAGE SYSTEM AND METHOD

WIPO Patent Application WO/2014/109059

A1

With conventional technology, consignment of re-encrypting processing is possible, but the cost of re-encryption processing is high and verification that the encryption consignee has executed the re-encryption properly is impossible. Provided is a re-encryption processing method that is a method in which a servicer (or data owner) executes encryption processing and for which processing costs for encryption are low. In addition, a method for confirming that data is correctly maintained at the external storage and a method for updating digital signatures for the data are provided. This encryption storage method combines reversible transformation known as all-or-nothing-transform (AONT) and partial encryption processing and encrypts the data as a whole. The ciphertext is divided into parts for which partial encryption has been carried out and other parts, and each of these are stored in different storage devices. Re-encryption processing is carried out using a private key and only parts processed by partial encryption.

JP2003233306	METHOD AND SYSTEM FOR EVALUATING SAFETY OF PUBLIC KEY ENCRYPTION AND PROGRAM FOR EVALUATING SAFETY OF PUBLIC KEY ENCRYPTION AND MEMORY MEDIUM STORING PROGRAM FOR EVALUATING SAFETY OF PUBLIC KEY ENCRYPTION
JPH08180108	METHOD AND DEVICE FOR PERMITTING USE OF SOFTWARE

WATANABE DAI (JP)
YOSHINO MASAYUKI (JP)

PCT/JP2013/050477

July 17, 2014

January 11, 2013

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HITACHI LTD (JP)

G09C1/00; G06F21/62; H04L9/14; H04L9/32

WO2006114841A1

2006-11-02

JP2008109611A	2008-05-08
JP2008035305A	2008-02-14
JP2008269173A	2008-11-06
JP2008242720A	2008-10-09

POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)

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