INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING SYSTEM AND INFORMATION PROCESSING PROCESS

Abstract

An information processing device (200) for managing article-related information relating to an article handled by multiple transactors forming a supply chain (SC) comprises: a database (DBK) in which each of several sets of private keys based on homomorphic encryption and public keys corresponding to the respective private keys is linked and stored with a key name; an encrypted information capture section (214) that captures encrypted information obtained from a transactor terminal (100) of a transactor by encrypting the article-related information using a public key, as well as the key name of the public key used to encrypt the article-related information;a key acquisition section (216) that acquires a private key from the database corresponding to the key name; a decrypted information acquisition section (218) that acquires decrypted information by decrypting the encrypted information using the private key; an encryption processing section (220) that encrypts the decrypted information to acquire re-encrypted information; and a provisioning section (222) that provides the re-encrypted information obtained by encryption through the encryption processing section to the transaction terminal.