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Cryptographic System And Cryptographic Method
Abstract: The purpose of the present invention is to provide predicate encryption that can keep attribute information set in encrypted text and predicate information set in a decryption key secret even with public key settings. An encryption device (200) generates encrypted text (ct) in which attribute information (x) is set as a coefficient for a base vector for a base (D). A mediation device (300) generates encrypted text (CT) by converting the base (D) for the encrypted text (ct) generated by the encryption device (200) to a base (B) using conversion information (W). A decryption device (400) decrypts the encrypted text (CT) generated by the mediation device (300) by a token (tk) that sets predicate information (v) as a base vector coefficient for a base (B*) corresponding to the base (B).
Notices, Deadlines & Correspondence
Patent Information
Applicants
MITSUBISHI ELECTRIC CORPORATION
Inventors
1. TAKASHIMA Katsuyuki
2. KAWAI Yutaka
Specification
SOFT COPY ATTACHED IN PDF
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 6824-CHENP-2015-FER.pdf | 2019-12-09 |
| 1 | Power of Attorney [02-11-2015(online)].pdf | 2015-11-02 |
| 2 | Form 5 [02-11-2015(online)].pdf | 2015-11-02 |
| 2 | 6824-CHENP-2015-Correspondence-041115.pdf | 2016-04-06 |
| 3 | Form 3 [02-11-2015(online)].pdf | 2015-11-02 |
| 3 | 6824-CHENP-2015-Form 1-041115.pdf | 2016-04-06 |
| 4 | Form 18 [02-11-2015(online)].pdf | 2015-11-02 |
| 4 | Description(Complete) [30-11-2015(online)].pdf | 2015-11-30 |
| 5 | Form 13 [30-11-2015(online)].pdf | 2015-11-30 |
| 5 | Form 1 [02-11-2015(online)].pdf | 2015-11-02 |
| 6 | Marked Copy [30-11-2015(online)].pdf | 2015-11-30 |
| 6 | Drawing [02-11-2015(online)].pdf | 2015-11-02 |
| 7 | Other Document [30-11-2015(online)].pdf | 2015-11-30 |
| 7 | Description(Complete) [02-11-2015(online)].pdf | 2015-11-02 |
| 8 | 6824-CHENP-2015.pdf | 2015-11-03 |
| 9 | Other Document [30-11-2015(online)].pdf | 2015-11-30 |
| 9 | Description(Complete) [02-11-2015(online)].pdf | 2015-11-02 |
| 10 | Drawing [02-11-2015(online)].pdf | 2015-11-02 |
| 10 | Marked Copy [30-11-2015(online)].pdf | 2015-11-30 |
| 11 | Form 13 [30-11-2015(online)].pdf | 2015-11-30 |
| 11 | Form 1 [02-11-2015(online)].pdf | 2015-11-02 |
| 12 | Form 18 [02-11-2015(online)].pdf | 2015-11-02 |
| 12 | Description(Complete) [30-11-2015(online)].pdf | 2015-11-30 |
| 13 | Form 3 [02-11-2015(online)].pdf | 2015-11-02 |
| 13 | 6824-CHENP-2015-Form 1-041115.pdf | 2016-04-06 |
| 14 | Form 5 [02-11-2015(online)].pdf | 2015-11-02 |
| 14 | 6824-CHENP-2015-Correspondence-041115.pdf | 2016-04-06 |
| 15 | Power of Attorney [02-11-2015(online)].pdf | 2015-11-02 |
| 15 | 6824-CHENP-2015-FER.pdf | 2019-12-09 |
Search Strategy
| 1 | searchstrategy_04-12-2019.pdf |