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.  

区块链技术在数据资产交易领域应用广泛。尤其针对公众的私有数据，此类数据不得流向未授权接收方，因此需确保交易记录与数据内容可审计、可追溯。本文基于双线性映射（bilinear mapping）构建了一种三重接收者公钥加密方案（triple receiver public key encryption scheme），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——即数字资产交换协议（Digital Asset Exchange Protocol）。在该三重接收者公钥加密方案中，发送方使用自身私钥及三位接收方的公钥对消息进行加密，随后三位接收方可各自使用私钥独立解密。上述过程无需参与者间交互即可实现迪菲-赫尔曼会话密钥（Diffie-Hellman session key）计算。通过形式化证明，我们验证：若间隙双线性迪菲-赫尔曼问题（gap bilinear Diffie-Hellman problem）与计算型迪菲-赫尔曼问题（computational Diffie-Hellman problem）具备难解性，则所提方案分别满足选择明文攻击安全性（chosen plaintext attack security）与自适应选择密文攻击安全性（adaptive chosen ciphertext attack security）。此外，该三重接收者公钥加密方案的安全性归约（security reduction）紧凑，且无归约损失。与Diameter提出的双重接收者加密方案相比，所提方案解密速度相近，但新增了一项关键功能：发送方与三位接收方可独立解密。最终评估结果表明，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。