HDMI Content Protection Key Exchange to Prevent Stream Leakage
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Solution Overview
Problem
Existing high-definition multimedia interface (HDMI) technologies face issues with audio/video stream leakage during HDCP authentication, as the stream is transmitted during the authentication process, compromising security.
Innovation Solution
Implementing authentication key exchange and session key agreement processes separately from audio/video stream transmission, ensuring authentication and stream transmission occur in different time periods, using authentication keys and session keys to encrypt the stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HDCP authentication is performed by transmitting audio/video stream during authentication process, then authentication can be completed, but audio/video stream leakage occurs compromising security
Solution Approach 1:
The patent segments the authentication process into two independent phases: authentication key exchange (performed without stream transmission) and authorized stream transmission (performed after authentication). This separation eliminates the security vulnerability where stream transmission occurs during authentication, as the stream is only transmitted after successful authentication and with proper authorization control.
Solution Approach 2:
The patent performs authentication key exchange and establishes security credentials before any audio/video stream transmission occurs. The transmit end and receive end complete mutual authentication and establish encryption keys in advance, ensuring that when the stream is subsequently transmitted, it is protected by established security measures rather than being exposed during the authentication process.
2Device complexity
If authentication and stream transmission are combined in the same process, then process simplicity is maintained, but security is compromised due to stream exposure during authentication
Solution Approach 1:
The patent divides the combined authentication and transmission process into distinct sequential stages: first performing authentication key exchange to establish security credentials, then performing authorized stream transmission using those credentials. This segmentation adds a clear separation point that enhances security without significantly increasing overall system complexity, as the two processes build upon each other in a logical sequence.
Data Source
AI summary
The technology of this application relates to a content transmission protection method and a related device, to avoid leakage of an audio/video stream when a transmit end and a receive end perform authentication. The method includes, in a process of establishing a transmission link between a transmit end and a receive end, the transmit end performs authentication key exchange with the receive end to obtain an authentication key. The transmit end performs session key agreement with the receive end based on the authentication key to obtain a session key. The transmit end performs authorization control on the receive end after establishment of the transmission link between the transmit end and the receive end is completed. The transmit end sends an encrypted audio/video stream to the receive end after the transmit end completes authorization control on the receive end. The encrypted audio/video stream is encrypted based on the session key.