Abstract: A system for conditionally tracing an anonymous transaction is provided, and cryptography technology is used to add tags to transaction-related information, and relies on implicit tags to achieve transaction traceability. In addition, based on the secret sharing idea, the information of reconstructed users' real transactions is divided, and differentiated information reconstruction methods are used to reduce the probability of collusion attacks, prevent the full scope of supervision without restriction, and reduce the traceability cost.

Abstract: A vehicle platoon incentive mechanism and system based on a double auction, a device, and a medium are provided. A highway system is conceived, where vehicles can be platooned and transmits their information to a controller. The controller searches for an optimal vehicle platoon to maximize a benefit of the vehicle platoon and redistribute the benefit among members in the vehicle platoon through a incentive mechanism to motivate a driver or a vehicle owner to form and maintain the optimal vehicle platoon. The incentive mechanism resolves a benefit conflict between vehicles through the benefit redistribution, thereby promoting formation of a stable and efficient vehicle platoon. The vehicle platoon incentive mechanism will make up for insufficient research on the vehicle platoon incentive mechanism. This mechanism can determine leader-follower positions and associated benefits, offering a potential solution to the instability in platooning behavior.

Abstract: A method for protecting location privacy in mobile payment is provided. A decentralized coin mixing idea is introduced into mobile payment, and an anonymous transaction model and a reputation evaluation model are constructed. A user reputation evaluation scheme is designed, and a reputation value of a user is measured based on historical behavior of the user. An anonymous transaction scheme based on reputation evaluation and a double auction is designed, and a functional relationship between the reputation value of the user and an auction bid is established. Candidate collaborative users who meet a reputation requirement, a privacy requirement and a bid standard of a requesting user are selected through a double auction, to construct an anonymous set. The anonymous set is inserted between the user and a merchant to cut off a direct transaction association between the user and the merchant to protect the location privacy of mobile payment users.

Abstract: The disclosure proposes a format-preserving encryption method based on a stream cipher. In this method, the first three digits of an area code are encrypted by segmenting a phone number, creating mapping rules, and establishing an area code permutation table for the first three digits of the area code, thereby ensuring a legality of an encryption result; an accuracy of encryption and decryption is ensured by performing an XOR operation on a key stream generated from the ZUC algorithm (i.e., Zu Chongzhi's algorithm) and the last seven or eight digits of the phone number, combining a modulo operation to achieve conformal encryption, and introducing a Lagrange interpolation formula. This method securely and effectively realizes a consistency and legitimacy of data formats before and after encryption, and well hides statistical characteristics of plaintext, so that data is protected during a transmission process without changing the formats.

Abstract: The disclosure proposes a format-preserving encryption method based on a stream cipher. In this method, the first three digits of an area code are encrypted by segmenting a phone number, creating mapping rules, and establishing an area code permutation table for the first three digits of the area code, thereby ensuring a legality of an encryption result; an accuracy of encryption and decryption is ensured by performing an XOR operation on a key stream generated from the ZUC algorithm (i.e., Zu Chongzhi's algorithm) and the last seven or eight digits of the phone number, combining a modulo operation to achieve conformal encryption, and introducing a Lagrange interpolation formula. This method securely and effectively realizes a consistency and legitimacy of data formats before and after encryption, and well hides statistical characteristics of plaintext, so that data is protected during a transmission process without changing the formats.