针对粮食供应链中信息共享时各主体面临的隐私问题，设计与实现了一个基于区块链和星际文件系统（interplanetary fle system，IPFS）技术的隐私保护系统.该系统利用区块链来保存加密隐私信息的哈希值和用户设置的权限访问控制策略，而真正的隐私信息则在加密后存储于IPFS，在实现隐私信息安全存储的同时保障了用户对自身信息的有效掌控.为了实现灵活的权限管理，系统将隐私信息进行了分类；为了提升访问透明度以及鼓励用户共享隐私信息，系统还设计了一种积分方案.
Aiming at the privacy issues faced by individuals in the sharing of information in the food supply chain, this paper designs and implements a privacy protection system based on blockchain and interplanetary fle system (IPFS). The system uses the blockchain to store the hash value of the encrypted private information and the permission access control policy set by the user, while the real private information is stored in the IPFS after being encrypted, which ensures the effective control of users to their own information while realizing the storage of privacy information security. In order to achieve flexible privilege management, the system classifes the privacy information; and in order to improve access transparency and encourage users to share their privacy information, the system also designs an integral scheme.
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