| 摘要 |
A method of building a secured unified public network for providing voice, video and data based on Internet Protocol (IP) and secured common channel signaling is disclosed. The network comprises a signaling network for common channel signaling; a data network for video, voice and data; a database for storing and processing digital keys and digital signatures; and the subscriber terminal devices connected to both the signaling network and the data network; The signaling network and database provide sign-on services, key exchange services, digital signature services and call processing services. The encrypted data are transmitted through the data network with shared keys of the caller and called parties.
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