| 摘要 |
A printer device comprises a data input device for receiving encrypted digital document files, a decryption algorithm for decrypting document files, a controller for controlling the printing of an image of data contained in the received file and a printer mechanism for printing a physical copy of the file. The controller operates the printing of the physical copy and after printing, deletes the electronic document file from the memory. Also disclosed is a computer entity comprising a data processor, memory, encryption algorithm, device selector, file selector and a stored list of set authorised recipient devices identified by unique identifier data inaccessibly embedded. The computer selects document files, selects printers, encrypts the files and addresses them to the selected uniquely identified devices. There is a system comprising a computer and recipient printer device, and a computer entity with an attached printer device. Also disclosed is a method of secure communication over a network by encrypting a document file, specifying a printer, attaching unique device identifier data, sending the file, receiving it, decrypting it, reading the identifier data, comparing it with a stored identifier data in the recipient device and if these match, printing the file.
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