Test data for Regulatable Mechanism for Transacting Data Assets

Blockchain technology is widely used in data asset transactions. Especially for the private data of the public, such data cannot be circulated to unauthorized receivers, it is necessary to ensure that the transaction records and data contents can be audited and traced. In this paper, based on bilinear mapping, we construct a triple receiver public key encryption scheme as a regulatable data asset transaction mechanism, and construct a blockchain data asset transaction platform, namely Digital Asset Exchange Protocol. In the triple receiver public key encryption scheme, the sender uses its private key and the public keys of the three receivers to encrypt the message, and then the three receivers can use their private keys to decrypt independently. The above process does not require interaction among participants to realize Diffie-Hellman session key calculation. Through formal proof, we prove that if the gap bilinear Diffie-Hellman problem and the computational Diffie-Hellman problem are difficult, the proposed examples has chosen plaintext attack security and adaptive chosen ciphertext attack security, respectively. In addition, the security reduction of the triple receiver public key encryption scheme is compact and there is no reduction loss. Compared with the duple receiver encryption scheme proposed by Diameter, the proposed scheme has a similar decryption speed, but it adds an important additional function, that is, the sender and the three receivers can decrypt independently. Eventually, evaluations show that the proposed scheme has both decentralized and trust management regulation capabilities, and is suitable for data asset transactions in the IoT.  

区块链技术已被广泛应用于数据资产交易场景。针对公众的私密数据而言，此类数据绝不能流向未授权接收方，因此必须保障交易记录与数据内容具备可审计、可追溯性。本文基于双线性映射（bilinear mapping）构建了一种三接收方公钥加密方案作为可监管的数据资产交易机制，并搭建了区块链数据资产交易平台——数字资产交易协议（Digital Asset Exchange Protocol）。在该三接收方公钥加密方案中，发送方借助自身私钥与三位接收方的公钥对消息进行加密，随后三位接收方可分别使用各自私钥独立完成解密。上述过程无需参与方之间进行交互，即可实现Diffie-Hellman会话密钥的计算。通过形式化证明，本文验证了当间隙双线性Diffie-Hellman问题与计算性Diffie-Hellman问题均为困难问题时，所提方案分别具备选择明文攻击安全性与自适应选择密文攻击安全性。此外，该三接收方公钥加密方案的安全归约过程紧凑且无归约损失。相较于Diameter提出的双接收方加密方案，本文所提方案的解密速度与之相当，但新增了一项关键附加功能：发送方与三位接收方均可独立完成解密。最终性能评估结果表明，所提方案兼具去中心化与信任管理监管能力，适用于物联网（IoT）场景下的数据资产交易。