Abstract: To enhance the security and confidentiality of patients’ medical privacy information, a secure encryption method based on chaotic mapping and the RC5(Rivest Cipher 5) algorithm is proposed. Firstly, the PCA(Principal Component Analysis) method is used to perform data dimension specification processing on medical privacy information data, completing dimensionality reduction of medical privacy information data. Then, using the RC5 block cipher algorithm, the key is initialized, transformed, and mixed to achieve secure encryption of medical privacy information. Finally, the dual chaotic system encryption algorithm ( EDC: Enhanced Dual Chaos) is used, combined with the high-quality performance of one-dimensional logistic mapping and two-dimensional Henon mapping, to achieve secondary encryption of medical privacy information. The experimental results show that the proposed method has high encryption efficiency, low information leakage rate, and strong anti attack performance.

Key words: chaotic mapping, rivest cipher 5 (RC5) algorithm, data dimension specification, 2D Henon mapping, one-dimensional logistic mapping