Two avowable quantum communication schemes

TL;DR

This paper introduces two novel avowable quantum communication schemes: a teleportation protocol ensuring non-repudiation and a secure direct communication method using hash functions for validation.

Contribution

The paper presents new protocols for avowable quantum communication, combining quantum cryptography with classical hash functions to prevent disavowal.

Findings

Teleportation protocol prevents sender and receiver from disavowing the communication

Secure direct communication scheme uses hash functions for message validation

Protocols leverage EPR pairs and an honest arbitrator for security

Abstract

Two avowable quantum communication schemes are proposed. One is an avowable teleportation protocol based on the quantum cryptography. In this protocol one teleports a set of one-particle states based on the availability of an honest arbitrator, the keys and the Einstein-Podolsky-Rosen pairs shared by the communication parties and the arbitrator. The key point is that the fact of the teleportation can neither be disavowed by the sender nor be denied by the receiver. Another is an avowable quantum secure direct communication scheme. A one-way Hash function chosen by the communication parties helps the receiver to validate the truth of the information and to avoid disavowing for the sender.