Cryptographic system, encryption device, re-encryption key generation device, re-encryption device, and cryptographic program


Ontology type: sgo:Patent     


Patent Info

DATE

2018-05-22T00:00

AUTHORS

Yutaka Kawai , Katsuyuki Takashima

ABSTRACT

An encryption device 200 outputs a ciphertext ct including a ciphertext c and a ciphertext c˜. The ciphertext c has been set with one of attribute information x and attribute information v related to each other. The ciphertext c˜ has been set with one of attribute information y and attribute information z related to each other. A decryption device 300 outputs a re-encryption key rk including a decryption key k*rk, a decryption key k˜*rk, and encrypted conversion information ϕrk. The decryption key k*rk is obtained by converting the decryption key k* which is set with the other one of attribute information x and attribute information v, with conversion information W1,t. The decryption key k˜*rk has been set with the other one of the attribute information y and the attribute information z. The encrypted conversion information ϕrk is obtained by encrypting the conversion information W1,t by setting one of attribute information x′ and attribute information v′ related to each other. A re-encryption device 400 outputs a re-ciphertext ret including a ciphertext crenc and a decryption key k*renc. The ciphertext crenc is obtained by setting one of additional information H and additional information Θ to the ciphertext ct. The decryption key k*renc is obtained by setting the other one of the additional information H and the additional information Θ to the re-encryption key rk. More... »

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