Abstract
The popularization of 5G and the development of cloud computing further promote the application of images. The storage of images in an untrusted environment has a great risk of privacy leakage. This paper outlines a design for a lightweight image encryption algorithm based on a message-passing algorithm with a chaotic external message. The message-passing (MP) algorithm allows simple messages to be passed locally for the solution to a global problem, which causes the interaction among adjacent pixels without additional space cost. This chaotic system can generate high pseudorandom sequences with high speed performance. A two-dimensional logistic map is utilized as a pseudorandom sequence generator to yield the external message sets of edge pixels. The external message can affect edge pixels, and then adjacent pixels interact with each other to produce an encrypted image. A MATLAB simulation shows the cipher-image performs fairly uniform distribution and has acceptable information entropy of 7.996749. The proposed algorithm reduces correlation coefficients from plain-image 1 to its cipher-image 0, which covers all of the plain-image characters with high computational efficiency (speed = 18.200374 Mbit/s). Theoretical analyses and experimental results prove the proposed algorithm’s persistence to various existing attacks with low cost.
Highlights
Multimedia data are vulnerable to interception and modification during transmission on public communication channels
Mobile devices are vulnerable to theft and loss due to their small size in a public environment
It is difficult to guarantee the security of personal information by relying solely on access control. erefore, the loss of mobile devices has serious security risks of privacy leakage [5, 6]
Summary
Parvaz and Zarebnia [17] define a combination chaotic system by using Logistic, Sine, and Tent systems and analyze its chaotic properties They applied the new chaotic system to design an image encryption algorithm, which is proved to be secure and practical. An image encryption algorithm based on a two-dimensional logistic map and DNA sequence operations is proposed in [19]. (1) We design a lightweight image encryption algorithm based on MP and two-dimensional logistic chaotic map, which has a high level of security with small space cost and high running performance. (3) MP allows the external message to affect edge pixels and spread across the image Based on this feature, we design a novel diffusion method that chaotic system is used to control the external message of MP.
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