| 摘要 |
The present invention relates to a facsimile apparatus with the ability of secure communication. The apparatus comprises a ten-key set for entering cipher key data used in secure communication, a RAM for holding the cipher key data, a DTMF signal transmission/reception circuit which sends the cipher key data held in the RAM to the receiving unit or receives the cipher key data from the sending unit over the telephone line, and a control circuit which, if the received cipher key data is found to be defective, requests the sending unit to send the cipher key data again. The sending unit transfers the cipher key which has been set only in the sending unit to the receiving unit so that it is set in the receiving unit, whereby enhanced secure communication can be established between the sending and receiving facsimile units.
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