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Approximate thumbnail-preserving encryption based on single-pixel imaging
Optics Express
|February 20, 2026
Summary
This study introduces a new thumbnail-preserving encryption (TPE) method using single-pixel imaging (SPI). TPE-SPI enhances security and usability for cloud visual data by improving encryption efficiency and visual quality.
Area of Science:
- Computer Science
- Information Security
- Image Processing
Background:
- Cloud storage of visual data faces security and privacy challenges.
- Traditional encryption hinders cloud image previewing.
- Thumbnail-preserving encryption (TPE) balances security and usability.
Purpose of the Study:
- To propose an efficient and secure TPE scheme for cloud visual data.
- To address limitations of existing TPE methods like long encryption times and low perceptual quality.
- To reduce the file expansion rate of encrypted images.
Main Methods:
- Developed an approximate thumbnail-preserving encryption scheme based on single-pixel imaging (TPE-SPI).
- Utilized bucket signals, speckle patterns, and image pixel relationships.
- Employed simple processing of bucket signals for encryption.
Main Results:
- Achieved higher encryption efficiency compared to existing schemes.
- Demonstrated better visual quality of the encrypted image.
- Effectively reduced the file expansion rate of encrypted images.
Conclusions:
- TPE-SPI offers an effective solution for secure and usable cloud visual data.
- The proposed method improves upon traditional TPE schemes in efficiency and quality.
- Single-pixel imaging provides a novel approach for image encryption.
