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

PATENT NO 9385867
APP PUB NO 20130336474A1
SERIAL NO

13982778

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
MITSUBISHI ELECTRIC CORPORATION7-3 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8310
NIPPON TELEGRAPH AND TELEPHONE CORPORATIONCHIYODA-KU TOKYO 100-8116

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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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