Communication method and apparatus for carrying out cipher communications telephonically
AssigneeMurata Kikai Kabushiki Kaisha
InventorYasuyuki Murakami
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Abstract
A communication method that can easily carry out cipher communication. At the caller, a secret key is produced based on data including the caller's own telephone number and the telephone number of the called station, and then image data is transmitted after enciphering it based on that secret key. At the called station, modem signal data including the telephone number of the caller transmitted during the ring off period of the call tone is received, the telephone number of the caller is detected from among that received data and a secret key is produced based on the telephone numbers of the caller and the called station. Afterwards when coded data is received, the coded data is deciphered based on that secret key and printed out.
Claims7
A communication method that enciphers data based on a predetermined key and transmits the data as well as deciphering received coded data based on a predetermined key, comprising the steps of:
- producing, at a caller side, said key based on data including at least a telephone number of the caller;
- and
- producing, at a receiver side, said key based on data including at least the telephone number of the caller that is transmitted during ring off periods of call tone.
A communication apparatus that enciphers data based on a predetermined key and transmits the data as well as deciphering received coded data based on a predetermined key, comprising:
- first key production means for producing a key based on data including at least a telephone number of the communication apparatus when the communication apparatus functions as a caller;
- and
- second key production means for producing a key based on data including at least the telephone number of the caller transmitted during a ring off period of a call tone when the communication apparatus functions as a receiver.
Dependencies are inferred from the claim text.