Content transmission protection method and related device thereof

A content transmission protection method, comprising:

• in a process of establishing a transmission link between a transmit end and a receive end, obtaining, by the receive end, an authentication key by performing authentication key exchange with the transmit end;
• obtaining, by the receive end, a session key by performing session key agreement with the transmit end based on the authentication key;
• responding, by the receive end, to authorization control of the transmit end after establishing the transmission link between the transmit end and the receive end;
• and
• after the transmit end completes authorization control on the receive end, receiving, by the receive end, an encrypted audio/video stream from the transmit end, wherein the audio/video stream is encrypted based on the session key, wherein obtaining the authentication key comprises:
• calculating, by the receive end, a signature and the authentication key;
• calculating on hash-based message authentication code (hmac) for authentication based on the authentication key calculated by the receive end;
• sending, by the receive end, a second message to the transmit end, wherein the second message includes the signature and the hmac for authentication calculated by the receive end, and the signature indicates an identity of the receive end;
• receiving, by the receive end, a third message from the transmit end, wherein the third message includes an authentication key authentication code calculated by the transmit end;
• calculating, by the receive end, an authentication key authentication code based on the authentication key calculated by the receive end;
• and
• in association with the receive end determining that the authentication key authentication code calculated by the transmit end is the same as the authentication key authentication code calculated by the receive end, caching the authentication key calculated by the receive end.

A system, comprising:

• a processor;
• and
• a memory configured to store computer readable instructions that, when executed by the processor, cause the system to:
• obtain an authentication key by performing authentication key exchange with a receive end;
• obtain a session key by performing session key agreement with the receive end;
• perform authorization control on the receive end;
• and
• send an encrypted audio/video stream to the receive end after the completing the authorization control on the receive end, wherein the system is further caused to:
• send a first message to the receive end, wherein the first message is used to request authentication;
• receive a second message from the receive end, wherein the second message comprises a signature and a hash-based message authentication code (hmac) for authentication calculated by the receive end, and the signature indicates identity of the receive end;
• calculate the authentication key;
• calculate an hmac for authentication based on the calculated authentication key;
• verify the signature in association with determining that the hmac for authentication is the same as the hmac for authentication calculated by the receive end;
• in association with successfully verifying the signature, calculate an authentication key authentication code based on the calculated authentication key;
• and
• send a third message to the receive end, wherein the third message includes the calculated authentication key authentication code.