Attack on a classical analogue of the Dunjko, Wallden, Kent and Andersson quantum digital signature protocol

Realization of quantum digital signatures without the requirement of quantum memory.

Digital signatures are widely used to provide security for electronic communications, for example, in financial transactions and electronic mail. Currently used classical digital signature schemes, however, only offer security relying on unproven computational assumptions. In contrast, quantum digital signatures offer information-theoretic security based on laws of quantum mechanics. Here, secu...

Secure quantum signatures using insecure quantum channels

Measurement-device-independent quantum digital signatures

Ittoop Vergheese Puthoor, Ryan Amiri, Petros Wallden, Marcos Curty, and Erika Andersson SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom LFCS, School of Informatics, University of Edinburgh, 10 Crichton Street, Edinburgh EH8 9AB, United Kingdom EI Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vi...

Quantum digital signatures without quantum memory.

Quantum digital signatures (QDSs) allow the sending of messages from one sender to multiple recipients, with the guarantee that messages cannot be forged or tampered with. Additionally, messages cannot be repudiated--if one recipient accepts a message, she is guaranteed that others will accept the same message as well. While messaging with these types of security guarantees are routinely perfor...

Free-Space Quantum Signatures Using Heterodyne Measurements.

Digital signatures guarantee the authorship of electronic communications. Currently used "classical" signature schemes rely on unproven computational assumptions for security, while quantum signatures rely only on the laws of quantum mechanics to sign a classical message. Previous quantum signature schemes have used unambiguous quantum measurements. Such measurements, however, sometimes give no...