Device-Independent Relativistic Quantum Bit Commitment
This addresses security vulnerabilities in quantum cryptography for applications requiring secure communication, though it appears incremental as it builds on existing relativistic and quantum frameworks.
The paper tackles the problem of location attacks in relativistic quantum bit commitment by proposing schemes immune to such attacks, showing they offer device-independent security against post-quantum adversaries under the no-signalling principle.
We examine the possibility of device-independent relativistic quantum bit commitment. We note the potential threat of {\it location attacks}, in which the behaviour of untrusted devices used in relativistic quantum cryptography depends on their space-time location. We describe relativistic quantum bit commitment schemes that are immune to these attacks, and show that these schemes offer device-independent security against hypothetical post-quantum adversaries subject only to the no-signalling principle. We compare a relativistic classical bit commitment scheme with similar features, and note some possible advantages of the quantum schemes.