Optical Image Encryption Using Biological Phase Plates
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Solution Overview
Problem
Existing optical image encryption technologies face challenges with large key information amounts, difficulty in transmission, lack of association between the key and the owner, and vulnerability to key theft or loss, leading to compromised security.
Innovation Solution
The method employs biological information such as fingerprint, iris, face, and voiceprint, using chaotic mapping to construct phase plates for preprocessing, followed by discrete cosine transform, Fresnel transformation, and phase truncation to encrypt images, with a computer-generated hologram for secure storage and transmission, and utilizes biological authentication for decryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical encryption methods use random phase masks with high resolution, then the key space becomes very large and security is improved, but the amount of key information becomes extremely large making transmission and storage difficult
Solution Approach 1:
The patent extracts only the essential features from biological information to generate compact phase masks, rather than using entire high-resolution biological images as keys. This extraction process reduces key information volume while maintaining the unique identifying characteristics needed for security.
Solution Approach 2:
The patent changes the parameter of key representation from full-resolution phase masks to down-sampled or feature-extracted phase masks. By altering the resolution and information density parameters, the system achieves both reduced key size and maintained security through the use of biological information-derived patterns.
2Ease of manufacture
If conventional encryption keys are used without biological information, then the system is simpler to implement, but the key can be stolen or lost and is not uniquely associated with the owner
Solution Approach 1:
The patent introduces biological information as an intermediary between the user and the encryption key. The biological information serves as a unique mediator that generates the phase mask key, ensuring both owner association and security while maintaining relative implementation simplicity through established biometric processing techniques.
Solution Approach 2:
The patent performs preliminary processing of biological information to generate the encryption key before the actual encryption process. This preliminary action of extracting and converting biological features into phase masks ensures that the key is already optimized and ready for use, simplifying the main encryption implementation while ensuring security through the unique biological source.
3Reliability
If complex encryption schemes are used, then security is enhanced, but the encrypted information becomes difficult to record and transmit without holographic technology
Solution Approach 1:
The patent uses computer-generated hologram technology to create digital copies of the encrypted information that can be easily stored and transmitted. The CGH process generates interference patterns that encode the encrypted data in a format suitable for digital storage, eliminating the need for physical holographic materials while maintaining security.
Solution Approach 2:
The patent replaces traditional optical-holographic recording systems with computer-generated algorithms. Instead of requiring physical holographic materials and complex optical paths for recording, the system uses computational methods to generate and process the encrypted information, making it easier to store and transmit digitally while maintaining the security benefits of holographic encryption principles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces key information volume, ensures secure transmission, and enhances system security by linking the key to the owner, preventing unauthorized access and ensuring data integrity through biological authentication.
Implementation Method 1
a first chaotic biological phase plate and a second chaotic biological phase plate are constructed by using a chaotic mapping method to preprocess the biological information
Implementation Method 2
performing discrete cosine transform on the original image to be encrypted
Implementation Method 3
performing Fresnel transformation on the encrypted image modulated by the first chaotic biological phase plate
Implementation Method 4
the reference light is introduced for interference through Fresnel diffraction
Data Source
AI summary
Image encryption and decryption methods based on biological information. The encryption method includes: obtaining the biological information; using the chaotic mapping method to preprocess the biological information to construct the first chaotic biological phase plate and the second chaotic biological phase plate; obtaining the original image to be encrypted and use the first chaotic biological phase plate and the second chaotic biological phase plate to determine the reconstructed optical encrypted image based on the discrete cosine transform method, and Fresnel transform method; and inputting reference light that interferes with the encrypted image of the reproduction light to determine the encrypted image. The invention can reduce the information amount of the key, improve the efficiency of storage and transmission, and improve security.