Adaptive Security Policy for Scalable Video Streaming
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Solution Overview
Problem
Existing video compression technologies face inefficiencies due to the need for transcoding and additional decoding at mid nodes, leading to performance issues and inadequate security, especially in scalable video coding (SVC) where selective encryption methods fail to ensure sufficient cryptographic strength and distortion control.
Innovation Solution
An adaptive security policy-based scalable video service apparatus and method that dynamically sets encryption parts, algorithms, and key lengths across layers based on service demands, network environments, and device performance, allowing for secure and efficient SVC video streaming without the need for decoding or decryption, enabling secure retransmission and private storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If selective encryption is applied to SVC video data, then security is improved, but cryptographic strength and distortion control are insufficient
Solution Approach 1:
The patent applies different encryption strengths and methods to different layers of the SVC video data. The base layer uses one encryption approach while enhancement layers use another, allowing security to be optimized for each layer's specific requirements and characteristics, thereby achieving both security and distortion control
Solution Approach 2:
The patent dynamically adjusts encryption parameters such as key length, algorithm selection, and encryption probability based on the layer type, network conditions, and security requirements. This allows the system to optimize the balance between cryptographic strength and distortion factor for each specific scenario
2Adaptability or versatility
If transcoding is performed at mid nodes to support various device performances, then adaptability is improved, but additional decoding and re-encoding burden increases complexity
Solution Approach 1:
The patent performs video encoding at multiple quality levels in advance, creating a scalable video bitstream with base layer and enhancement layers. This preliminary multi-layer encoding eliminates the need for real-time transcoding at mid nodes, as the pre-encoded layers can be directly selected and transmitted based on device performance requirements
Solution Approach 2:
The patent divides the video data into separate base layer and enhancement layers, each optimized for different quality requirements. This segmentation allows receivers to select only the necessary layers based on their capabilities, eliminating the need for complex transcoding operations at intermediate nodes
3Adaptability or versatility
If base layer and enhancement layers are separated in SVC, then adaptability to network conditions is improved, but security policy management becomes more complex
Solution Approach 1:
The patent applies different security policies to different layers based on their importance and characteristics. The base layer, which contains essential video information, receives stronger security protection while enhancement layers use appropriate security measures for their specific requirements, optimizing security management for each layer's role
Data Source
AI summary
An adaptive security policy based scalable video service apparatus includes a video streaming server, an adaptive security policy server and a terminal. The video streaming server receives a service demand via a network and generates an encrypted streaming data. The adaptive security policy server analyzes a media structure and the service demand, by using a service profile received from the video streaming server, so as to generate a security policy description. The terminal generates and transmits the service demand to the video streaming server or the adaptive security server, obtains the encrypted streaming data from the video streaming server and decrypts the encrypted streaming data for playback, storing and retransmission.