KEYWORDS: Data transmission, Blockchain, Computer security, Systems modeling, Receivers, Information security, Design and modelling, Security technologies, Public key cryptography, Data processing
Blockchain, as a distributed database, has been wildly used in real-world applications. Different systems based on blockchain form data silos. Therefore, cross-chain data transmission is required to realize value transfer in different systems. In the process of cross-chain data transmission, authentication is important for data security. In this work, we design an auditable anonymous authentication scheme for cross-chain data transmission. In our scheme, the sender can generate anonymous authentication message on the data. Then the receiver of the target blockchain knows the data is sent by a legal user of the original blockchain, but cannot know the real identity of the sender. By using Trusted Execution Environment (TEE) and pseudo identity methods, our scheme is more efficient than the similar anonymous authentication schemes in blockchain.
In the quantum cheque schemes that have been proposed, a strong quantum capability of the user is required and the quantum resources consumption is relatively high. To solve this problem, we propose a quan tum cheque protocol based on quantum state computational distinguishability, in which a bank issues a blank cheque, a semi-classical user can sign the amount on the cheque and finally the bank verifies the validity of the cheque. Compared to existing scheme, our scheme requires less quantum capability and reduces the overhead of quantum resource. Since the scheme is based on a hard problem that can resist quantum attacks, the quantum cheque cannot be forged or altered.
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