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Although key distribution is arguably the most studied context on which toapply quantum cryptographic techniques, message authentication, i.e.,certifying the identity of the message originator and the integrity of themessage sent, can also benefit from the use of quantum resources. Classically,message authentication can be performed by techniques based on hash functions.However, the security of the resulting protocols depends on the selection ofappropriate hash functions, and on the use of long authentication keys. In thispaper we propose a quantum authentication procedure that, making use of justone qubit as the authentication key, allows the authentication of binaryclassical messages in a secure manner.Comment: LaTeX, 6 page

Quantum authentication of classical messages