System for the safe transmission of messages

摘要

A system for safe transmission of a message with positive identification of the sender includes on the transmitter side telefax-type message-transmitting apparatus (10) and encryption means (22) for encrypting transmission signals from the telefax apparatus prior to transmission, and includes on the receiver side decryption means (25) for decrypting incoming signals prior to their receipt in telefax-type apparatus (20), and message enveloping and message gathering means (21) for safe storage of messages received by the telefax apparatus (20) in an enveloped form within a closed casing (11). Activating means (23) on the transmitter side includes a card reader (231) and keyboard (232) and is intended to activate the encryption means (22) in response to signals from the card reader (231) and the keyboard (232). Control means (24) on the receiver side function are adapted to activate the decryption means (25) in response to signals emanating from the card reader (231) and the keyboard (232). The control means (24) causes a marking to be applied to the top of each printed sheet commenced in the telefax apparatus (20) on the receiver side, this marking disclosing whether the transmitted message is an encrypted message or a clear language message.