Patent ID: 8229088
Filing Date: 2012-07-24
Classification: G06Q,H04L,H04M

Abstract:
1. A time authentication system that uses, as a recording time, a time authenticated by a time authentication authority when recording a call between a plurality of terminal devices each having a voice communication function, wherein each terminal device of said plurality of terminal devices comprises: means for requesting said time authentication authority to issue a unique background sound data that is determined by said time authentication authority when said time authentication authority receives a request, the unique background sound data being difficult for those other than said time authentication authority to conjecture beforehand; means for storing the unique background sound data received from said time authentication authority and an electronic certificate electronically signed by adding a first time stamp to a hash of said unique background sound data; means for reproducing a unique background sound from the unique background sound data; means for mixing a voice to a terminal device of the plurality of terminal device with the reproduced unique background sound to generate a mixed sound; means for performing a transmission of the mixed sound to another terminal device of the plurality of terminal devices; means for recording said call including voices of speakers and the unique background sound from the terminal and the another terminal; means for storing said call as voice data when finishing recording said call; means for calculating a hash of said voice data and requesting the time authentication of said voice data of said time authentication authority; and means for storing a second electronic certificate issued by said time authentication authority, said second electronic certificate electronically signed by adding a second time stamp to the hash of said voice data.