Quantum Cryptography

The journey of quantum cryptography (QC) was started in the early 1960s by Wiesner’s seminal idea of quantum money, which cannot be counterfeited. In 1984, the very first quantum key distribution protocol was proposed by Bennett and Brassard. Although QKD remains the main topic of QC, in the last few years, several other quantum cryptographic primitives are also hugely studied, like quantum secret sharing, bit commitment, private set intersection, secure direct communication, digital signatures, private query, and many more. However, the main motivation of QC is to provide an unconditional security to the cryptographic protocols. But, the information leakage through side-channels has been observed in the practical implementations of quantum cryptographic protocols. To eliminate these side-channel attacks, several security models have been proposed, such as device-independent (DI), measurement- device-independent (MDI), etc. The main goal of our research is to propose several quantum cryptographic protocols and analyze their security in the DI or MDI model.