On the Security of the Ping-Pong Protocol

TL;DR

This paper reviews the security of the ping-pong quantum communication protocol, refutes recent attacks, and clarifies misconceptions about its security proof, reinforcing its robustness against certain attack scenarios.

Contribution

It provides a critical analysis of recent attack claims and defends the original security proof of the ping-pong protocol, clarifying its security under various attack models.

Findings

Refutes a recent attack on an ideal quantum channel.

Shows that a recent claim against the original security proof is incorrect.

Reaffirms the security of the ping-pong protocol against multiple attack scenarios.

Abstract

We briefly review the security of the ping-pong protocol in light of several attack scenarios suggested by various authors since the proposal of the protocol. We refute one recent attack on an ideal quantum channel, and show that a recent claim of falseness of our original security proof is erroneous.