Title:
DATA DECODING DEVICE, ATTRIBUTE-BASED ENCRYPTION SYSTEM, RANDOM NUMBER ELEMENT REMOVING DEVICE, RANDOMIZED SECRET KEY GENERATION DEVICE, DATA DECODING METHOD, AND DATA DECODING PROGRAM
Document Type and Number:
WIPO Patent Application WO/2014/112182
Kind Code:
A1
Abstract:
The purpose of the present invention is to enhance the security of encoded data by executing attribute-based encryption-type decoding processing stage by stage, the processing being divided into a plurality of stages. A KEM key part decoding section (320) decodes an encoded KEM key (313) that is a common key encoded by using an attribute condition expression, by using an r-user secret key (221) that is obtained by including a random number element in a user secret key generated by an attribute-based encryption method, thereby to generate an r-KEM key mask value (321) that includes a random number element. A random number element removal request section (330) requests an IC card (400) to remove the random number element from the r-KEM key mask value (321), and obtains a KEM key mask value (411) from the IC card (400). A mask removal section (340) generates a KEM key (341) by using the KEM key mask value (411). A data decoding section (350) obtains target data (301) by decoding encoded data main body (312), by using the KEM key (341).
Inventors:
MATSUDA NORI (JP)
HATTORI MITSUHIRO (JP)
ICHIKAWA SACHIHIRO (JP)
ITO TAKASHI (JP)
HIRANO TAKATO (JP)
HATTORI MITSUHIRO (JP)
ICHIKAWA SACHIHIRO (JP)
ITO TAKASHI (JP)
HIRANO TAKATO (JP)
Application Number:
PCT/JP2013/079736
Publication Date:
July 24, 2014
Filing Date:
November 01, 2013
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G09C1/00
Domestic Patent References:
| WO2012011564A1 | 2012-01-26 | |||
| WO2011086687A1 | 2011-07-21 |
Other References:
TSUKASA ISHIGURO: "Improvement of Attribute- based Encryption in Mobile Cloud Computing", CSS2011 COMPUTER SECURITY SYMPOSIUM 2011 RONBUNSHU, IPSJ SYMPOSIUM SERIES, vol. 2011, no. 3, 12 October 2011 (2011-10-12), pages 421 - 426, XP055263608
KATSUHISA KAWAGUCHI: "Zokusei Base Ango to sono Oyo", 2009 NEN SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY SCIS2009, 20 January 2009 (2009-01-20), pages 1 - 6, XP008179832
B.WATERS: "Ciphertext-policy attribute-based encryption: an expressive, efficient, and provably secure realization", PKC, 2011
M.GREEN; S.HOHENBERGER; B.WATERS: "Outsourcing the Decryption of ABE Ciphertexts", PROCEEDINGS OF THE 20TH USENIX CONFERENCE ON SECURITY, 2011
KATSUHISA KAWAGUCHI: "Zokusei Base Ango to sono Oyo", 2009 NEN SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY SCIS2009, 20 January 2009 (2009-01-20), pages 1 - 6, XP008179832
B.WATERS: "Ciphertext-policy attribute-based encryption: an expressive, efficient, and provably secure realization", PKC, 2011
M.GREEN; S.HOHENBERGER; B.WATERS: "Outsourcing the Decryption of ABE Ciphertexts", PROCEEDINGS OF THE 20TH USENIX CONFERENCE ON SECURITY, 2011
Attorney, Agent or Firm:
MIZOI, Shoji et al. (JP)
Shoji Mizoi (JP)
Shoji Mizoi (JP)
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