田中 俊昭

In this paper, we present an authentication mechanism for ISDB-T broadcast streams, especially a One-Seg broadcast stream, which is suitable for low-power devices. Our method makes it possible to authenticate data streams at a low computational cost. The method requires a small memory for buffering to process the broadcast stream and is resistant to packet-loss. We evaluated the computational cost of our method by computer simulation and theoretical estimation, and we show here that our method achieved good properties for authenticating data streams broadcast through lossy channels, e.g. wireless channels. Furthermore, we developed a mobile phone that can authenticate One-Seg broadcast streams with our method, and we report the effectiveness of our scheme here.