Encryption Device Using Photoelectric Random Numbers
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Solution Overview
Problem
Conventional encryption methods using image signals from array sensors rely on pseudo-random numbers, which can be deciphered and copied, compromising security.
Innovation Solution
An encryption device and method that generates encryption keys based on true photoelectric random numbers from array sensors, making it difficult to decipher the encryption key by allocating electrical signal values to different pixel positions and re-acquiring random numbers upon unauthorized access, and configuring the encryption key generation unit, encryption unit, and array sensor in a single package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pseudo-random numbers generated using software are used as encryption keys, then encryption can be performed on image signals, but the encryption key can be deciphered and copied, compromising security
Solution Approach 1:
The patent replaces software-based pseudo-random number generation with hardware-based photoelectric conversion. The array sensor converts light signals into electrical signals that serve as true random numbers for encryption key generation, substituting a physical process for a computational one to achieve higher security
Solution Approach 2:
The patent changes the fundamental parameter of randomness generation from algorithmic (software) to physical (photoelectric conversion). By using the inherent randomness of photoelectric conversion processes in an array sensor, the system generates truly random numbers instead of pseudo-random numbers, fundamentally improving key security
2Reliability
If encryption keys are generated using photoelectric conversion in array sensors, then it becomes more difficult to decipher the encryption key, but the device complexity increases due to integration requirements
Solution Approach 1:
The patent merges the array sensor, encryption key generation unit, and encryption unit into a single integrated device. This combination allows the system to leverage the photoelectric conversion capabilities of the array sensor while performing encryption operations, achieving high security without requiring separate external components for key generation
Solution Approach 2:
The array sensor serves multiple functions: it acts as both the imaging device for capturing image signals and the random number generator for encryption key creation. This multi-functionality reduces the need for additional dedicated components, simplifying the overall device architecture while maintaining high security standards
3Reliability
If photoelectric random numbers are used for encryption, then security is improved, but the difficulty of detecting and measuring the random number quality increases
Solution Approach 1:
The patent incorporates a feedback mechanism where the control unit monitors the uniformity of electrical signals generated by the array sensor. Based on this feedback, the system determines whether the signals meet the required randomness criteria and adjusts or re-acquires random numbers accordingly, ensuring high quality encryption keys
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
Enhances security by making it difficult to decipher the encryption key and prevents unauthorized access, while also promoting tamper-proofness and reducing the risk of key leakage.
Implementation Method 1
photoelectric random numbers that are random numbers obtained on the basis of photoelectric conversion performed by an array sensor in which a plurality of pixels having light-receiving elements for visible light or non-visible light are one-dimensionally or two-dimensionally arranged
Data Source
AI summary
An encryption device includes: an encryption key generation unit that generates an encryption key on the basis of photoelectric random numbers that are random numbers obtained on the basis of photoelectric conversion performed by an array sensor in which a plurality of pixels having light-receiving elements for visible light or non-visible light are one-dimensionally or two-dimensionally arranged; and an encryption unit that performs encryption of a target signal on the basis of the encryption key generated by the encryption key generation unit. Accordingly, it is possible to realize encryption that makes deciphering of an encryption key more difficult as compared to a case in which pseudo-random numbers are used, and thus it is possible to promote improvement of security.