The Development of Privacy Telephone Sets in Encryption System against Eavesdropping

摘要

We developed an encryption system using an AES encoding algorithm for the Internet telephone system security to prevent eavesdropping. It works through tapping by encoding/decoding the output data of the Internet telephone on the sending and receiving sides when the caller or callee is making an internet phone call. The developed encryption system has the merit of no deterioration of voice data not related to the encoding process. The privacy telephone set against eavesdropping was designed to prevent eavesdropping on internet telephones during communication and involved encoding/decoding the output data at the transmitter and receiver of internet telephones.