Abstract:
A communication apparatus includes a communication unit. When receiving a request to start communication from a second communication apparatus during communication with a first communication apparatus, the communication unit transmits to the second communication apparatus a communication disabled notification with a retransmission time period indicating a time until the request to start communication again. In addition, when receiving a request to start communication from a third communication apparatus after completing the communication with the first communication apparatus and before receiving the request to start communication sent again from the second communication apparatus based on the retransmission time period, the communication unit does not start data reception from the third communication apparatus so as to give priority to data communication with the second communication apparatus.
Abstract:
A facsimile device includes: an operation part; a storage part for storing therein the same common key as in a reception-side facsimile device; a transmission data generation part for generating message data; an encryption key generation part for generating an encryption key with use of a signal value of a cryptograph-generation applied signal, which is a signal selected from among signals transmitted to and received from the reception-side facsimile device; an encryption part for generating encrypted data of the message data with use of the generated encryption key; and a communication part for transmitting the encrypted data and decryption information including information as to the cryptograph-generation applied signal to the reception-side facsimile device.