Abstract
Digital signatures play an important role in software distribution, modern communication and financial transactions, where it is important to detect forgery and tampering. Signatures are a cryptographic technique for validating the authenticity and integrity of messages, software, or digital documents. The security of currently used classical schemes relies on computational assumptions. Quantum digital signatures (QDS), on the other hand, provide information-theoretic security based on the laws of quantum physics. Recent work on QDS shows that such schemes do not require trusted quantum channels and are unconditionally secure against general coherent attacks. However, in practical QDS, just as in quantum key distribution (QKD), the detectors can be subjected to side-channel attacks, which can make the actual implementations insecure. Motivated by the idea of measurement-device-independent quantum key distribution (MDI-QKD), we present a measurement-device-independent QDS (MDI-QDS) scheme, which is secure against all detector side-channel attacks. Based on the rapid development of practical MDI-QKD, our MDI-QDS protocol could also be experimentally implemented, since it requires a similar experimental setup.
Highlights
Digital signatures are techniques for guaranteeing the authenticity and integrity of a message
Quantum digital signatures (QDS), on the other hand, provide information-theoretic security based on the laws of quantum physics
Motivated by the idea of measurementdevice-independent quantum key distribution (MDI-QKD), we present a measurement-device-independent QDS (MDI-QDS) scheme, which is secure against all detector side-channel attacks
Summary
Digital signatures are techniques for guaranteeing the authenticity and integrity of a message. They play a significant role for example in financial transactions, software distribution, and e-mail. Signature schemes allow a sender to exchange messages with many recipients, with the assurance that the messages cannot be forged or tampered with. Signed messages are transferable, and cannot be repudiated. Transferability means that a message, which is accepted by an honest recipient, will be accepted by another recipient if the message is forwarded. Nonrepudiation is related to transferability and means that a sender cannot successfully deny having sent a signed message
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