Position-based cryptography by means of quantum and classical schemes, using multiple-valued logic computing

Position-Based Quantum Cryptography

In this work, we initiate the study of position-based cryptography in the quantum setting. The aim is to use the geographical position of a party as its only credential. This has interesting applications, e.g., it enables two military bases to communicate over insecure channels and without having any pre-shared key, with the guarantee that only parties within the bases learn the content of the ...

Position-Based Quantum Cryptography: Impossibility and Constructions

In this work, we study position-based cryptography in the quantum setting. The aim is to use the geographical position of a party as its only credential. On the negative side, we show that if adversaries are allowed to share an arbitrarily large entangled quantum state, the task of secure position-verification is impossible. To this end, we prove the following very general result. Assume that A...

Quantum Computing and Quantum Cryptography

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Quantum Computing and Cryptography

On Classical and Quantum Cryptography

Lectures on classical and quantum cryptography. Contents: Private key cryp-tosystems. Elements of number theory. Public key cryptography and RSA cryp-tosystem. Shannon's entropy and mutual information. Entropic uncertainty relations. The no cloning theorem. The BB84 quantum cryptographic protocol. Security proofs. Bell's theorem. The EPRBE quantum cryptographic protocol.