Access restriction system, access restriction method and access restriction program

摘要

To provide an access restriction system, an access restriction method, and an access restriction program that can restrict an access to data registered in a block chain.SOLUTION: An access restriction system 1 restricting an access to information registered in a public block chain 10 comprises a private block chain 20 installed in each of multiple user groups, a data registration part 31 that encrypts data to register in the public block chain 10, and a key registration part 32 registering a key used in the encryption in the private block chain 20 installed in a user group to which data browsing is permitted.SELECTED DRAWING: Figure 1