Coherent Image Encryption via Phase Bandwidth Constraints
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Solution Overview
Problem
Existing methods for encrypting image data fail to secure coherent image analysis while allowing individual image analysis, as they either destroy phase information or do not prevent coherent image analysis without decryption.
Innovation Solution
A method that modifies phase values of image pixels based on a first encryption key, ensuring the rate of phase change between adjacent pixels does not exceed the signal bandwidth, allowing individual image analysis while preventing coherent image analysis without decryption, and optionally using classical encryption techniques for additional security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase values are modified based on encryption key to secure coherent image analysis, then data security is improved, but individual image analysis capability deteriorates
Solution Approach 1:
The patent modifies phase values of image pixels by adding encrypted phase differences based on an encryption key, while constraining the rate of phase change between adjacent pixels to not exceed the signal bandwidth. This parameter transformation secures coherent image analysis by making phase information unreadable without the key, while the bandwidth constraint preserves individual image analysis capability by maintaining phase continuity within each image.
2Loss of information
If phase information is encrypted to prevent coherent image analysis, then information security is improved, but phase continuity is lost
Solution Approach 1:
The patent applies parameter transformation by encrypting phase values through addition of encrypted phase differences while enforcing a constraint that the rate of phase change between adjacent pixels does not exceed the signal bandwidth. This maintains phase continuity and stability within each image, preventing loss of phase composition while securing information against coherent analysis attacks.
3Ease of operation
If encryption is applied to image data, then access control is improved, but image coherence is destroyed
Solution Approach 1:
The patent applies encryption locally to phase values of individual pixels while maintaining global coherence properties. By encrypting phase information at the pixel level with controlled phase changes, the patent enables differential access control where individual images can be analyzed separately while coherent analysis across multiple images requires decryption, thus achieving local encryption with global coherence preservation.
Solution Approach 2:
The patent transforms the phase parameter of image pixels by adding encrypted phase differences constrained by signal bandwidth. This parameter change implements access control by making coherent phase analysis impossible without the encryption key, while the bandwidth constraint ensures that individual image coherence is preserved for authorized viewing.
4Object-affected harmful factors
If phase values are modified to prevent coherent analysis, then security against coherent attacks is improved, but phase information utility deteriorates
Solution Approach 1:
The patent modifies phase values by adding encrypted phase differences while constraining the rate of change to not exceed signal bandwidth. This parameter transformation provides security against coherent attacks by making phase information unreadable without the key, while preserving phase information utility for individual image analysis by maintaining phase continuity and avoiding excessive phase variations.
Data Source
AI summary
A computer-implemented method for encrypting image, wherein the image data is generated by collection of a signal, the signal having a bandwidth, and the image data comprises data corresponding to a plurality of pixels of an image, wherein each pixel has an associated phase value; and the method comprises the step of modifying each of the phase values respectively associated with each of the plurality of pixels based on a first encryption key, wherein a rate of change of phase between adjacent pixels, after the step of modifying each of the phase values, does not exceed the bandwidth.