ENCRYPTION INTERMEDIATE SYSTEM

摘要

In a transaction system for purchasing goods, information is transmitted and received through a transaction management device (5). That is, the transaction management device (5) receives encrypted information from a transmitter, decrypts the information using a decryption key for the transmitter, then re-encrypts the information using an encryption key for the receiver with the authentication of the transaction management device (5), and transmits it to the receiver. For example, when a goods purchase request is transmitted, the transaction management device (5) receives encrypted goods purchase request information, accesses a purchaser information DB (51) to 'authenticate the purchaser, retrieves the decryption key for the purchaser from an encryption key management DB (50), and decrypts the received goods purchase request. Then, it stores the goods purchase information in a transaction management DB (55), retrieves from the encryption key management DB (50) the encryption key for the seller who is the receiver of the information, and re-encrypts the goods purchase information with the authentication of the transaction management device (5). Then, the re-encrypted goods purchase information is transmitted to the seller's processing unit (2). In a transaction system for purchasing goods, information is transmitted and received through a transaction management device (5). That is, the transaction management device (5) receives encrypted information from a transmitter, decrypts the information using a decryption key for the transmitter, then re-encrypts the information using an encryption key for the receiver with the authentication of the transaction management device (5), and transmits it to the receiver. For example, when a goods purchase request is transmitted, the transaction management device (5) receives encrypted goods purchase request information, accesses a purchaser information DB (51) to 'authenticate the purchaser, retrieves the decryption key for the purchaser from an encryption key management DB (50), and decrypts the received goods purchase request. Then, it stores the goods purchase information in a transaction management DB (55), retrieves from the encryption key management DB (50) the encryption key for the seller who is the receiver of the information, and re-encrypts the goods purchase information with the authentication of the transaction management device (5). Then, the re-encrypted goods purchase information is transmitted to the seller's processing unit (2).