Remote control of VCR with electronic mail

摘要: A security apparatus and a method for controlling electric devices by use of electronic mails. modem receives an mail sent from sending side stores the received into RAM controller. CPU extracts certification information encrypted secret key user decrypts public key. Based on decrypted information, determines whether is authentic or not. Only when found authentic, control command extracted RAM. Then, transmits to confirming content control. If approving confirmation returned side, second obtained encrypting different that mentioned above, again sender and, if executes before.