| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a key sharing system which can inhibit a secret key from being leaked.SOLUTION: A key sharing system comprises a sender device, a recipient device, a key issuance station device, and a key management DB. The key management DB can be accessed only by the key issuance station device. The sender device comprises: a public key request transmission unit; and an encryption unit. The recipient device comprises: a key pair registration request transmission unit; a key use request transmission unit; a temporary key generation unit; a key decryption request transmission unit; and a decryption unit. The key issuance station device comprises: a master key generation unit; a key pair generation unit; a public key transmission unit; a master public key transmission unit; a key decryption unit; and a key returning unit.</p> |
