| 摘要 |
<p>An encrypted key updating system includes an encryption module and a multiplexing module in the transmitting terminal, and a demultiplexing module and a session key generating module in the receiving terminal, wherein: the encryption module, for encrypting a multimedia stream to form a cipher text by session key, and transmitting the cipher text to the multiplexing module; the multiplexing module, for multiplexing an encrypted key updating message and a cipher text to form a multiplexed data stream, and transmitting the multiplexed data stream to the demultiplexing module, the encrypted key updating message containing the parameters needed to generate the session key; the demultiplexing module, for separating the encrypted key updating message and the cipher text from the received multiplexed data stream; the session key generating module, for decrypting and reverting out the parameters needed to generate the session key from the encrypted key updating message, and the updated session key is generated based on the parameters. A transmitting terminal and a receiving terminal for realizing encrypted key updating, and an encrypted key updating method, a method for transmitting the encrypted key updating message and a receiving method are provided.</p> |
