一种基于区块链的医疗数据隐私保护方法

为解决医疗数据的泄露或恶意被窜改以及医疗纠纷问题，提出一种基于区块链的医疗数据隐私保护方法。利用哈希算法加密患者的身份信息，治疗结果通过AES（advanced encryption standard）算法加密，而AES的密钥使用ECC（ellipse curve ctyptography）算法加密，所有的加密密钥、治疗结果、患者身份信息存储到联盟链上。采用群签名技术追溯签名医院，群管理员可以解密医疗数据，将其作为重要依据协助第三方解决医疗纠纷。效率分析表明，在安全性相同情况下，该方法较的加/解密效率比对比方案分别提高了14%和46%，同时分析了群签名各类算法的时间开销。通过与同类方法对比，该方法既可实现患者身份、医疗数据的分类隐私保护，又可保证交易存储开销是合理的，在医疗数据隐私保护领域具有一定的应用价值。

Medical data privacy protection method based on blockchain

To address the issue of medical data leakage or malicious tampering, as well as medical disputes, this paper proposed a medical data privacy protection method based on blockchain. The hash algorithm encrypted the patient''s identity information, the AES(advanced encryption standard) algorithm encrypted treatment results, the ECC(ellipse curve ctyptography) algorithm encrypted the AES key. The blockchain stored all encryption keys, treatment results, and patient identity information. By using group signature technology to trace signed hospitals, the group administrator could decrypt medical data, therefore using it as an important basis to assist third parties in resolving medical disputes. Efficiency analysis shows that under the same security conditions, this method improves the encryption and decryption efficiency by about 14% and 46% compared to the compared schemes, at the same time, the method analyzed the time cost of various group signature algorithms. Compared with similar methods, this method can not only achieve classification privacy protection of patient identity and medical data, but also ensure reasonable transaction storage costs. It has certain application value in the field of medical data privacy protection.