Simultaneous Compression and Encryption via Keystream Permutation
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Solution Overview
Problem
Existing methods for simultaneous compression and encryption of data often result in suboptimal compression ratios due to encryption hiding statistical redundancies, leading to inefficient file size reduction and security vulnerabilities, particularly when dealing with data-rich media formats like audio and video.
Innovation Solution
The proposed solution integrates encryption into the compression process using a keystream to optimize and randomize the compression/encryption process, employing a block cipher to ensure secure and efficient transmission and storage of multimedia data, allowing for simultaneous compression and encryption in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption is performed before compression, then security is improved, but compression ratio deteriorates because encryption hides statistical redundancies
Solution Approach 1:
The patent merges encryption and compression into a single integrated operation. The compression algorithm's probability model is modified to incorporate encryption by using a keystream to randomly permute the cumulative probability distribution, allowing both compression and encryption to occur simultaneously without sequential processing.
Solution Approach 2:
A keystream serves as an intermediary between the compression model and the output. The keystream randomly permutes the cumulative probability distribution during compression, acting as a mediator that enables both compression efficiency and encryption security within the same process.
2Loss of substance
If traditional sequential compression then encryption is used, then compression ratio is optimized, but device complexity and processing time increase
Solution Approach 1:
The patent combines two separate operations (compression and encryption) into one unified process. By modifying the arithmetic encoder to incorporate keystream-based random permutation of the probability model, the system achieves both compression and encryption in a single pass, reducing computational complexity and processing time.
Solution Approach 2:
The modified arithmetic encoder serves multiple functions simultaneously: it performs compression by encoding symbols according to their probability distribution, and it performs encryption by randomly permuting that distribution using the keystream. This multi-functional approach eliminates the need for separate compression and encryption modules.
3Reliability
If random statistical updates are used for simultaneous compression and encryption, then security is provided, but compression ratio deteriorates because optimal compression cannot be achieved
Solution Approach 1:
The keystream acts as an intermediary that systematically permutes the cumulative probability distribution based on the current model state rather than using random updates. This deterministic yet unpredictable permutation maintains compression efficiency by preserving the statistical structure while providing encryption.
Solution Approach 2:
The patent changes the parameters of the probability model dynamically during encoding by applying keystream-based permutations to the cumulative distribution. This allows the model to adapt to the input data while simultaneously providing encryption, maintaining optimal compression ratios.
Data Source
AI summary
Embodiments of reversible systems and methods for fast, secure and efficient transmission, storage, and protection of digital multimedia are disclosed. The embodiments may have the ability to simultaneously compress and encrypt digital data in order to concurrently reduce data size and prevent reconstruction without the proper encryption key. Embodiments of a method may include pre-processing data to optimize the size of data segments to be compressed, transforming the data for improving the compressibility of the before-mentioned data segments, processing the data sequentially to generate predictive statistical models, encoding the data for simultaneously encrypting and compressing data segments using a keystream, and increasing both the compression ratio and security of these encoding processes using a block cipher. Embodiments of these methods may be suitable for use on both encrypted and unencrypted media.