| 摘要 |
An electronic data encryption and decryption system includes: a privileged user device, a user device, and an encrypted data generation device. The privileged user device has: privileged user key generation means for generating a privileged user secret key x and a privileged user public key x·P (P is a generator); first session key generation means for generating a session key K; and first decryption means for decrypting the encrypted data by using the session key K generated by the first session key generation means. The user device has: user key generation means for generating a user secret key r, a user public key r·P, and a public key rx·P; second session key generation means for generating a session key K; and a second decryption key for decrypting the encrypted data by using the session key K generated by the second session key generation means. The data generation device has: third session key generation means for generating the session key K by using the public key rx·P, session key generation information s, and a random point Q; and means for encrypting the input electronic data by using the session key K generated by the third session key generation means. |
