Digital Content Scrambling Block Reordering Compression Efficiency
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Solution Overview
Problem
Existing digital content scrambling techniques are inefficient due to their vulnerability to brute force reverse engineering and compatibility issues with compression and decompression processes, leading to residual errors and reduced compression efficiency.
Innovation Solution
A content transformation process that subdivides digital content into blocks, reorders them according to a mapping scheme, and applies overlap areas to reduce edge artifacts, allowing for efficient compression and decompression while maintaining security through a separate descrambling module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If content distortion techniques are applied before compression, then security against brute force attacks is improved, but compression efficiency deteriorates due to loss of spatial and temporal correlations
Solution Approach 1:
The patent divides the content into smaller blocks or tiles that are independently scrambled and compressed. This segmentation allows the compression algorithm to process smaller units with preserved local correlations, improving compression efficiency while maintaining security through the scrambling operation.
Solution Approach 2:
The patent applies scrambling as a preliminary action before compression, but designs it to be compatible with subsequent compression operations. The scrambling is performed in a way that preserves the structural information needed for efficient compression, allowing the compression step to proceed effectively after the preliminary scrambling.
2Reliability
If content is scrambled using traditional techniques, then security is improved, but residual errors occur during decompression due to lossy compression operating on different data
Solution Approach 1:
The patent implements a feedback mechanism where control parameters generated during the distortion process are used to guide the restore module. This feedback loop ensures that the decompression process accurately reverses the scrambling operations, eliminating residual errors while maintaining security.
Solution Approach 2:
The patent uses control parameters that are modified during the scrambling process and subsequently used to guide the restore module. These parameter changes ensure that the decompression operation precisely reverses the scrambling, eliminating residual errors while maintaining security against brute force attacks.
3Productivity
If tight integration with encoder and decoder is implemented, then compression efficiency is improved, but device complexity and deployment difficulty increase
Solution Approach 1:
The patent designs the scrambling and unscrambling operations to be universally applicable with standard encoders and decoders. The control parameters and block-based approach enable compatibility with existing compression technologies, eliminating the need for tight integration while maintaining compression efficiency.
Solution Approach 2:
The patent introduces control parameters as an intermediary between the scrambling operation and the compression/decoding process. These parameters mediate the interaction between the scrambling module and the compression algorithm, enabling efficient compression without requiring tight integration or modification of existing encoder/decoder hardware.
4Productivity
If blocks are reordered according to a mapping scheme, then compression efficiency is improved, but the complexity of the descrambling process increases
Solution Approach 1:
The patent uses control parameters that copy the mapping scheme information from the scrambling process to the descrambling process. This copying mechanism enables the descrambling module to efficiently reverse the block reordering without requiring complex analysis or computation, maintaining compression efficiency while simplifying the descrambling complexity.
Data Source
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AI summary
There are described methods and apparatus for scrambling digital content, such as video or audio content, by dividing the digital content into blocks set out in an original arrangement, and reordering the blocks from the original arrangement to a scrambled arrangement. Additional manipulation transforms such as rotations and reflections may be applied to individual blocks. A subsequent compression step may then be carried out. Methods and apparatus for carrying out corresponding descrambling of digital content are also described.