Facsimile equipment having a secure communication function
First Claim
1. A facsimile apparatus having a secure communication function comprising:
- input means for entering cipher key data used in the secure communication;
memory means for holding the cipher key data entered through said input means;
data transmission means for sending the cipher key data held in said memory means to a receiving unit;
data reception means for receiving the cipher key data sent from a sending unit;
cipher verification means for verifying whether the cipher key data sent from said sending unit is complete; and
means of generating a recurrent transfer request signal and sending it to a sending unit in the event of detection of defective cipher key data by said cipher verification means.
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Accused Products
Abstract
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.
13 Citations
18 Claims
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1. A facsimile apparatus having a secure communication function comprising:
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input means for entering cipher key data used in the secure communication; memory means for holding the cipher key data entered through said input means; data transmission means for sending the cipher key data held in said memory means to a receiving unit; data reception means for receiving the cipher key data sent from a sending unit; cipher verification means for verifying whether the cipher key data sent from said sending unit is complete; and means of generating a recurrent transfer request signal and sending it to a sending unit in the event of detection of defective cipher key data by said cipher verification means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A facsimile apparatus having a secure communication function comprising:
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input means for entering cipher key data used in the secure communication; memory means for holding the cipher key data entered through said input means; check code calculating means for calculating a first error check code corresponding to the cipher key data input from said input means; data transmission means for sending the cipher key data and the first error check code held in said memory means to a receiving unit; data reception means for receiving cipher key data and first error check code sent from a sending unit; storing means for storing the cipher key data and first error check code sent from said sending unit; cipher verification means for calculating a second error check code corresponding to the cipher key data sent from said sending unit and for verifying whether the cipher key data sent from said sending party is complete by comparing the first error check code with the second error check code; means of generating a recurrent transfer request signal and sending it to said sending unit upon detection of defective cipher key data by said cipher verification means; and means of generating a receiving signal and sending it to said sending unit upon detection of complete cipher key data by said cipher verification means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification