HDCP Authentication Messaging for Lower Delay and Packet Overhead
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Solution Overview
Problem
The current HDCP technology introduces extra delay and overheads in the authentication process when later versions (HDCP 2.1, 2.2, 2.3) are downward compatible with HDCP 2.0, delaying the start of encrypted data transmission.
Innovation Solution
A communication method that allows for combined sending of initialization and information packets when both network elements support a version later than HDCP 2.0, reducing the duration and packet overheads required for authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If later-version HDCP (2.1, 2.2, 2.3) performs downward compatibility with HDCP 2.0 authentication process, then compatibility between different HDCP versions is improved, but authentication delay and packet overheads increase
Solution Approach 1:
The patent segments the authentication message into multiple parts: a first message containing version identification information, and subsequent messages containing authentication data. This allows the receiving end to identify the HDCP version early and process authentication accordingly, reducing overall authentication delay while maintaining compatibility across different HDCP versions.
Solution Approach 2:
The patent implements preliminary action by having the transmitting end send version identification information in advance before the actual authentication process. This allows the receiving end to prepare the appropriate authentication protocol in advance, avoiding delays that would occur if version negotiation had to happen during the authentication process itself.
2Adaptability or versatility
If later-version HDCP (2.1, 2.2, 2.3) performs downward compatibility with HDCP 2.0 authentication process, then compatibility between different HDCP versions is improved, but packet overheads increase
Solution Approach 1:
The patent merges the version identification information with the authentication message structure, allowing both version negotiation and authentication to occur within an integrated messaging framework. This reduces the need for separate overhead packets that would otherwise be required for version negotiation, thereby reducing total packet overheads while maintaining multi-version compatibility.
Solution Approach 2:
The authentication message structure is designed to be universal and multi-functional, capable of carrying both version identification information and authentication data in a single standardized format. This eliminates the need for version-specific message structures and reduces the overhead associated with maintaining multiple separate authentication protocols for different HDCP versions.
3Loss of information
If separate transmission of authentication messages is used, then message clarity is improved, but authentication duration increases
Solution Approach 1:
The patent implements continuous useful action by establishing a streamlined authentication message flow where version identification and authentication data transmission are seamlessly connected. The receiving end continuously processes incoming messages without interruption, maintaining an uninterrupted authentication sequence that reduces overall authentication duration while preserving message clarity through standardized formatting.
Data Source
AI summary
A first network element obtains first indication information. The first indication information indicates that at least one version in a high-bandwidth digital content protection HDCP version supported by a second network element is not earlier than a first preset version; or the first indication information indicates an HDCP version supported by the second network element; and at least one version in the HDCP version supported by the second network element is not earlier than the first preset version. The first network element sends a first authentication message to the second network element based on the first indication information, where the first authentication message includes a first random number and capability indication information of the first network element.