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VoIP(Voice over Internet Protocol) is low-cost, flexible and brings great convenience to people's life, but it also brings security problems such as cyber-crime issues. This paper aims to solve security problem by using speech recognition technology to identify the speaker automatically. The system uses zero-copy module to capture packets in high-speed environment. NIC driver sends packets to the applications directly to shorten the data transmitting path. It reduces the number of data copy and system call times, and avoid the system switching states frequently between core state and user state. Experiment shows that the high-performance zero-copy packet capture module can always reach wire-speed.
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