| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice and data encryption/decoding unit in a mobile communication system, that can prevent wire tapping and to provide its method. SOLUTION: The unit for encrypting/decoding voice/data and its method in a mobile communication system subjects VOCODing or bypassing a signal sent from a wireless channel block to scramble the VOCODing and bypassed signal, through the use of a random number and transmit the scrambled signal to a wired channel block. Furthermore, the scrambled signal received from the wired channel block is descrambled according to the random number, depending on the presence of detection of a synchronizing signal, vocoded or bypassed and sent to the wireless channel block. Thus, maintainability in the wired channel block between the system and the vocoder can be maintained considerably, so as to prevent wire tapping in advance.
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