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Man-in-the-middle attack on the BB84 protocol is presented. The man in the middle can intercept the message from the sender and send his message to the receiver in every step of the BB84 protocol. The attack can be analogously used on other quantum key distribution schemes. Some methods are suggested to defense against the attack by discovering the attack or handicapping the attack, and the security...
We consider one of the quantum key distribution protocols recently introduced in Ref. [Pirandola et al., Nature Phys. 4, 726 (2008)]. This protocol consists of a two-way quantum communication between Alice and Bob, where Alice encodes secret information via a random phase-space displacement of a coherent state. In particular, we study its security against a specific class of individual attacks which...
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