Title:
ENCRYPTION PROCESSING SYSTEM, KEY GENERATION DEVICE, KEY DEVOLVEMENT DEVICE, ENCRYPTION DEVICE, DECODING DEVICE, ENCRYPTION PROCESSING METHOD, AND ENCRYPTION PROCESSING PROGRAM
Document Type and Number:
WIPO Patent Application WO/2011/083678
Kind Code:
A1
Abstract:
A predicate encryption capable of devolving authority is attained. An encryption process is performed by using a space V and a space V* which are dual vector spaces (dual distortion vector spaces) related to each other by a pairing operation. An encryption device generates a vector in the space V, in which transmission information is put, as an encryption vector. A decoding device performs the pairing operation with respect to the encryption vector generated by the encryption device and a key vector, which is a predetermined vector in the space V*, and decodes the encryption vector, thereby extracting information relating to the transmission information. In particular, the encryption device and the decoding device perform the encryption process without using a part of the dimension of the space V and the space V*.
Inventors:
TAKASHIMA KATSUYUKI (JP)
OKAMOTO TATSUAKI (JP)
OKAMOTO TATSUAKI (JP)
Application Number:
PCT/JP2010/072912
Publication Date:
July 14, 2011
Filing Date:
December 20, 2010
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
NIPPON TELEGRAPH & TELEPHONE (JP)
TAKASHIMA KATSUYUKI (JP)
OKAMOTO TATSUAKI (JP)
NIPPON TELEGRAPH & TELEPHONE (JP)
TAKASHIMA KATSUYUKI (JP)
OKAMOTO TATSUAKI (JP)
International Classes:
G09C1/00; H04L9/08
Other References:
T. OKAMOTO ET AL.: "Hierarchical Predicate Encryption for Inner-Products", LECTURE NOTES IN COMPUTER SCIENCE, vol. 5912, 1 December 2009 (2009-12-01), pages 214 - 231, XP019134479
T. OKAMOTO ET AL.: "A Geometric Approach on Pairings and Hierarchical Predicate Encryption", POSTER SESSION, EUROCRYPT 2009, April 2009 (2009-04-01)
D. BONEH ET AL.: "Anonymity from Asymmetry: New Constructions for Anonymous HIBE", POSTER SESSION, EUROCRYPT 2009, April 2009 (2009-04-01), XP008167761, Retrieved from the Internet [retrieved on 20110113]
J. KATZ ET AL.: "Predicate Encryption Supporting Disjunctions, Polynomial Equations, and Inner Products", CRYPTOLOGY EPRINT ARCHIVE, 8 July 2008 (2008-07-08), XP008149983, Retrieved from the Internet [retrieved on 20100526]
A. LEWKO ET AL.: "New Techniques for Dual System Encryption and Fully Secure HIBE with Short Ciphertexts", CRYPTOLOGY EPRINT ARCHIVE, XP008161861, Retrieved from the Internet [retrieved on 20110113]
T. OKAMOTO ET AL.: "Hierarchical Predicate Encryption with Inner-Products from a Single DDH-like Assumption", 2010 NEN SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY (SCIS2010), 19 January 2010 (2010-01-19), YOKOSHU, pages 2C3 - 3, XP008167753
See also references of EP 2523178A4
T. OKAMOTO ET AL.: "A Geometric Approach on Pairings and Hierarchical Predicate Encryption", POSTER SESSION, EUROCRYPT 2009, April 2009 (2009-04-01)
D. BONEH ET AL.: "Anonymity from Asymmetry: New Constructions for Anonymous HIBE", POSTER SESSION, EUROCRYPT 2009, April 2009 (2009-04-01), XP008167761, Retrieved from the Internet
J. KATZ ET AL.: "Predicate Encryption Supporting Disjunctions, Polynomial Equations, and Inner Products", CRYPTOLOGY EPRINT ARCHIVE, 8 July 2008 (2008-07-08), XP008149983, Retrieved from the Internet
A. LEWKO ET AL.: "New Techniques for Dual System Encryption and Fully Secure HIBE with Short Ciphertexts", CRYPTOLOGY EPRINT ARCHIVE, XP008161861, Retrieved from the Internet
T. OKAMOTO ET AL.: "Hierarchical Predicate Encryption with Inner-Products from a Single DDH-like Assumption", 2010 NEN SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY (SCIS2010), 19 January 2010 (2010-01-19), YOKOSHU, pages 2C3 - 3, XP008167753
See also references of EP 2523178A4
Attorney, Agent or Firm:
MIZOI, Shoji et al. (JP)
Shoji Mizoi (JP)
Shoji Mizoi (JP)
Download PDF:
Claims:
Previous Patent: LIQUID CRYSTAL COMPOUND, LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT
Next Patent: AQUEOUS COSMETIC PREPARATION
Next Patent: AQUEOUS COSMETIC PREPARATION