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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 adjacentdoi:10.1155/2020/7151836 doaj:c15638cbfe864ddba2dbffc2f6dc4c07 fatcat:bkbkp27gtneunhmhuw3rnd7kki