Group signature schemes play a vital role in protecting identity privacy of a member of a group who signs a message using the group signature. However, in the existing group signature schemes the centralized group manager has control over all the participants, and these managers can be malicious. They may take a biased decision when there is a dispute among the group members or while revealing the identity of a group member. To overcome the trust issues related to centralized group managers and to improve user privacy, a decentralized group signature scheme (DGSS) is proposed by decentralizing the role of the group manager. The proposed scheme will be more suitable for decentralized environments like a blockchain. Security analysis along with the proof of correctness is also provided for the proposed scheme. A framework for a blockchain-based e-auction protocol using the DGSS is also proposed in this paper.
Intelligent traffic systems are pervasive computing applications for developing efficient transportation network in urban areas using GPS probe devices. These systems eliminate traffic congestion, cut back on fuel consumption and reduce travel time. They help the users to choose optimized route to their destinations by providing traffic information dynamically. Any data leakage in the transmission may lead to tracing of individual vehicles resulting in breach of individual privacy causing security and financial loss to them. Forging the data from GPS probe messages during transmission may also lead to utter chaos of road traffic predictions resulting in wrong signals for the users and disturbs entire road traffic system itself. Therefore data privacy is a key issue in such environments. Secured GPS based Traffic monitoring system is proposed in this paper to handle the above issues. This system captures RMC format probe data and transmits securely to probe land center by means of a communication service provider. The probe land center analyses all the probe messages received and determines traffic congestion at various locations and advises the traffic users. Various issues related to the security of the probe data systems are examined and a light weight symmetric algorithm is proposed to encrypt probe data for ensuring data privacy efficiently.
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