The rapid development of the Internet of Things (IoT) has led to the emergence of more and more novel applications in recent years. One of them is the e-health system, which can provide people with high-quality and convenient health care. Meanwhile, it is a key issue and challenge to protect the privacy and security of the user's personal health record. Some cryptographic methods have been proposed such as encrypt user's data before sharing it. However, it is complicated to share the data with multiple parties (doctors, health departments, etc.), due to the fact that data should be encrypted under each recipient's keys. Although several (t, n) threshold secret sharing schemes can share the data only need one encryption operation, there is a limitation that the decryption private key has to be reconstructed by one party. To offset this shortcoming, in this paper, we propose an efficient identity-based distributed decryption scheme for personal health record sharing system. It is convenient to share their data with multiple parties and does not require to reconstruct the decryption private key. We prove that our scheme is secure under chosen-ciphertext attack (CCA). Moreover, we implement our scheme by using the Java pairing-based cryptography (JPBC) library on a laptop and an Android phone. The experimental results show that our system is practical and effective in the electronic personal health record system.

中文翻译：

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基于身份的高效个人电子健康记录共享系统分布式解密方案


近年来，物联网（IoT）的快速发展催生了越来越多新颖的应用。其中之一就是电子医疗系统，它可以为人们提供优质、便捷的医疗保健。同时，保护用户个人健康记录的隐私和安全也是一个关键问题和挑战。已经提出了一些加密方法，例如在共享用户数据之前对其进行加密。然而，由于数据应该在每个接收者的密钥下加密，因此与多方（医生、卫生部门等）共享数据很复杂。虽然多个(t,n)门限秘密共享方案只需要一次加密操作就可以共享数据，但存在一个限制，即解密私钥必须由一方重建。为了弥补这一缺点，本文提出了一种用于个人健康记录共享系统的高效的基于身份的分布式解密方案。方便与多方共享其数据，并且不需要重建解密私钥。我们证明我们的方案在选择密文攻击（CCA）下是安全的。此外，我们通过在笔记本电脑和 Android 手机上使用基于 Java 配对的密码学 (JPBC) 库来实现我们的方案。实验结果表明，本系统在个人电子健康档案系统中实用、有效。