Improving Wójcik's eavesdropping attack on the ping–pong protocol

Improved Wójcik's eavesdropping attack on ping-pong protocol without eavesdropping-induced channel loss

The “Ping-Pong” Protocol Can Be Attacked without Eavesdropping

Comment on 'Eavesdropping on the ping-pong communication protocol'

Ping-Pong Protocol Eavesdropping in Almost Perfect Channels

Ping-Pong Protocol Strengthening against Pavičić’s Attack

On the security of the ping-pong protocol