| 摘要 |
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. |
