Cryptographic processing system, key generation device, encryption device, decryption device, key delegation device, cryptographic processing method, and cryptographic processing program
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United States of America Patent
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Jul 5, 2016
Grant Date -
Dec 19, 2013
app pub date -
Dec 12, 2011
filing date -
Feb 9, 2011
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Abstract
Hierarchical predicate encryption (HPE) for inner products with enhanced efficiency of operations. A cryptographic processing system includes a key generation device, an encryption device, and a decryption device. The key generation device generates, as a decryption key skL, a vector in which predicate information v{right arrow over ( )}t is embedded in a basis vector of a basis B*t for each integer t of t=1, . . . , L. The encryption device generates, as a ciphertext ct, a vector in which attribute information x{right arrow over ( )}t is embedded in a basis vector of a basis Bt for at least some integer t of t=1, . . . , L. The decryption device performs a pairing operation on the decryption key skL generated by the key generation device and the ciphertext ct generated by the encryption device, and decrypts the ciphertext ct.
First Claim
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
MITSUBISHI ELECTRIC CORPORATION | 7-3 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8310 | |
NIPPON TELEGRAPH AND TELEPHONE CORPORATION | CHIYODA-KU TOKYO 100-8116 |
International Classification(s)
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- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Okamoto, Tatsuaki | Tokyo, JP | 30 | 1679 |
Takashima, Katsuyuki | Tokyo, JP | 33 | 383 |
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