目的 针对中医药医疗大数据实现数据共享，打通各环节流程，提高医疗数据的透明性、可追溯性，同时保障个人医疗数据的安全隐私，提出一种面向临床医疗数据的区块链安全与隐私保护方案。方法 通过区块链技术实现医疗数据的跨平台共享，本文提出一种基于加法的同态加密和基于范围的零知识证明算法，来保证中医药大数据的安全性和合法性。结果 在区块链对临床医疗数据存储场景下，各个中医院和医保中心可以对患者医疗数据进行共享访问，同时本文提供的同态加密和零知识证明算法具备很好的性能。结论 为了满足各个医疗平台之间的患者医疗数据的共享访问诉求，同时保障医疗数据的安全性和满足数据的可追溯性，必须借助于区块链技术才能完成。本文提出的基于paillier加法同态加密与基于环签名的范围零知识证明方案对临床医疗区块链的数据进行隐私保护。

Objective To share the data of Traditional Chinese Medicine (TCM) medical big data, open up all processes, improve the transparency and traceability of medical data, and ensure the security and privacy of personal medical data, and to propose a blockchain security and privacy protection scheme for clinical medical data.Methods Through the blockchain technology, the cross platform sharing of medical data was achieved. This paper proposed a homomorphic encryption algorithm based on addition and zero knowledge proof algorithm based on range to ensure the security and legitimacy of big data of TCM.Results In the scenario of blockchain storing clinical medical data, each hospital of TCM and medical insurance center shared and accessed the patient"s medical data. At the same time, the homomorphic encryption and zero knowledge proof algorithm provided in this paper had good performance.Conclusion In order to meet the demands of patients" medical data sharing and access between various medical platforms, ensure the security of medical data and meet the traceability of data, it must be completed with the help of blockchain technology. This paper proposes a range zero knowledge proof scheme based on Paillier addition homomorphic encryption and ring signature to protect the data privacy of clinical medical blockchain.