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See detailPost-quantum Plaintext-awareness
Ebrahimi, Ehsan UL; van Wier, Jeroen UL

in Post-quantum Plaintext-awareness (2022, September 28)

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See detailDeniable Public-Key Authenticated Quantum Key Exchange
van Wier, Jeroen UL; Atashpendar, Arash UL; Roenne, Peter UL

E-print/Working paper (n.d.)

In this work, we explore the notion of deniability in public-key authenticated quantum key exchange (QKE), which allows two parties to establish a shared secret key without leaving any evidence that would ... [more ▼]

In this work, we explore the notion of deniability in public-key authenticated quantum key exchange (QKE), which allows two parties to establish a shared secret key without leaving any evidence that would bind a session to either party. The deniability property is expressed in terms of being able to simulate the transcripts of a protocol. The ability to deny a message or an action has applications ranging from secure messaging to secure e-voting and whistle-blowing. While quite well-established in classical cryptography, it remains largely unexplored in the quantum setting. Here, we first present a natural extension of classical definitions in the simulation paradigm to the setting of quantum computation and formalize the requirements for a deniable QKE scheme. We then prove that the BB84 variant of QKE, when authenticated using a strong designated verifier signature scheme, satisfies deniability and, finally, propose a concrete instantiation. [less ▲]

Detailed reference viewed: 29 (4 UL)