Information processing device and information processing method
An information processing device includes a first recording unit, a verification unit, and a second recording unit. In response to a request from an information management device that manages data, the first recording unit records information regarding a browsing right of data in a blockchain. The verification unit verifies a zero-knowledge proof for proving that a user is a valid user who has been given the browsing right on the basis of the information regarding the browsing right written in the blockchain. The second recording unit records information regarding a verification result of the proof in the blockchain.
1 . An information processing device, comprising:
a control circuit configured to:
record a hash value and information regarding a browsing right of data in a blockchain based on a request from an information management device that manages the data, wherein the hash value is obtained by a hashing process on the information regarding the browsing right with secret information shared between a data requester that requests the data and the information management device;
verify, based on the information regarding the browsing right written in the blockchain, a zero-knowledge proof to prove that a user is a valid user with the browsing right; and
record information regarding a verification result of the zero-knowledge proof in the blockchain, wherein the recorded information regarding the verification result excludes specific information that associates the zero-knowledge proof with the information regarding the browsing right.
2 . The information processing device according to claim 1 , wherein the control circuit is further configured to:
update the information regarding the browsing right; and
record the updated information in the blockchain.
3 . The information processing device according to claim 1 , wherein the control circuit is further configured to:
update, based on the request from the information management device, a revocation list recorded in the blockchain; and
verify, prior to the verification of the zero-knowledge proof, whether a prover of the zero-knowledge proof is included in the revocation list.
4 . An information processing method, comprising:
recording a hash value and information regarding a browsing right of data in a blockchain based on a request from an information management device that manages the data, wherein the hash value is obtained by a hashing process on the information regarding the browsing right with secret information shared between a data requester that requests the data and the information management device;
verifying, based on the information regarding the browsing right written in the blockchain, a zero-knowledge proof for proving that a user is a valid user with the browsing right; and
recording information regarding a verification result of the zero-knowledge proof in the blockchain, wherein the recorded information regarding the verification result excludes specific information that associates the zero-knowledge proof with the information regarding the browsing right.
5 . A non-transitory computer-readable medium having stored thereon, computer-executable instructions which, when executed by a computer, cause the computer to execute operations, the operations comprising:
recording a hash value and information regarding a browsing right of data in a blockchain based on a request from an information management device that manages the data, wherein the hash value is obtained by a hashing process on the information regarding the browsing right with secret information shared between a data requester that requests the data and the information management device;
verifying, based on the information regarding the browsing right written in the blockchain, a zero-knowledge proof for proving that a user is a valid user with the browsing right; and
recording information regarding a verification result of the zero-knowledge proof in the blockchain, wherein the recorded information regarding the verification result excludes specific information that associates the zero-knowledge proof with the information regarding the browsing right.