Improving Classical Authentication with Quantum Communication

Details Improving Classical Authentication with Quantum Communication Improving Classical Authentication with Quantum Communication

2008-06-06

arxiv.org/abs/0806.1231v2

Computer Science

Information Theory

New improved version, with several clarifications in the text and new figures

Scientific paper

We propose a quantum-enhanced protocol to authenticate classical messages, with improved security with respect to the classical scheme introduced by Brassard in 1983. In that protocol, the shared key is the seed of a pseudo-random generator (PRG) and a hash function is used to create the authentication tag of a public message. We show that a quantum encoding of secret bits offers more security than the classical XOR function introduced by Brassard. Furthermore, we establish the relationship between the bias of a PRG and the amount of information about the key that the attacker can retrieve from a block of authenticated messages. Finally, we prove that quantum resources can improve both the secrecy of the key generated by the PRG and the secrecy of the tag obtained with a hidden hash function.

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