FIELD: physics; communication.
SUBSTANCE: invention relates to exchange of messages. A system, terminal, method and carrier use a certificate of authorisation to grant a sender the authority to send a communication message to a recipient. The system for controlling reception of the message by the recipient includes a transmission terminal and reception terminal. The transmission terminal can send a communication message to the sender. The reception terminal can determine whether the communication message is cryptographically linked to the certificate of authorisation. Determination of whether a communication message is cryptographically linked to the certificate of authorisation can include determination of whether a communication message has been signed by the sender using a private encryption key.
EFFECT: receiver can quickly and easily determine whether to receive a message.
21 cl, 9 dwg
