An electronic data protection system

摘要

The system includes : a storage medium (1) for storing an encrypted electronic data, a medium number and encrypted permission information; a vendor computer having a personal key generating unit (21) for generating a medium key based on the medium number (12), an electronic data decrypting key (22), and an encrypting unit (23) for encrypting the electronic data decrypting key based on the medium key to generate the encrypted permission information. The user computer having a personal key generating unit (31) for generating a medium key based on the medium number, a decrypting unit (32) for decrypting the encrypted permission information based on the medium key to generate the electronic data decrypting key which is the same as the electronic data decrypting key of the vendor computer, and a decrypting unit (34) for decrypting the encrypted electronic data (14) based on the electronic data decrypting key (33) to generate a plain text electronic data.