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1. US20130336474 - Cryptographic processing system, key generation device, encryption device, decryption device, key delegation device, cryptographic processing method, and cryptographic processing program

官庁 アメリカ合衆国
出願番号 13982778
出願日 12.12.2011
公開番号 20130336474
公開日 19.12.2013
特許番号 09385867
特許付与日 05.07.2016
公報種別 B2
IPC
H04K 1/00
H電気
04電気通信技術
K秘密通信;通信妨害
1秘密通信
H04L 9/28
H電気
04電気通信技術
Lデジタル情報の伝送,例.電信通信
9秘密または安全な通信のための配置
28特殊な暗号化アルゴリズムを使用するもの
H04L 9/08
H電気
04電気通信技術
Lデジタル情報の伝送,例.電信通信
9秘密または安全な通信のための配置
08キーの分配
H04L 9/30
H電気
04電気通信技術
Lデジタル情報の伝送,例.電信通信
9秘密または安全な通信のための配置
28特殊な暗号化アルゴリズムを使用するもの
30公開キー,すなわち暗号化アルゴリズムが計算上解読不可能であり,使用者の暗号キーが機密を要しないもの
CPC
H04L 9/3073
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
30Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
3066involving algebraic varieties, e.g. elliptic or hyper-elliptic curves
3073involving pairings, e.g. identity based encryption [IBE], bilinear mappings or bilinear pairings, e.g. Weil or Tate pairing
H04L 9/0836
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
08Key distribution ; or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
0816Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
0819Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
083involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
0833involving conference or group key
0836using tree structure or hierarchical structure
出願人 Katsuyuki Takashima
Mitsubishi Electric Corporation
Tatsuaki Okamoto
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
発明者 Katsuyuki Takashima
Tatsuaki Okamoto
代理人 Oblon, McClelland, Maier & Neustadt, L.L.P.
優先権情報 2011026216 09.02.2011 JP
発明の名称
(EN) Cryptographic processing system, key generation device, encryption device, decryption device, key delegation device, cryptographic processing method, and cryptographic processing program
要約
(EN)

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.