The non-coherent attack on the ping-pong protocol with completely entangled pairs of three-dimensional quantum systems (qutrits) is analyzed. The expression for the amount of the eavesdropper's information as functions of attack detection probability is derived. It is shown that the security of the ping-pong protocol with pairs of qutrits is higher than the security of the protocol with pairs of qubits. It is also shown that with the use by legitimate users in a control mode of two mutually unbiased measuring bases, the ping-pong protocol with pairs of qutrits possesses only asymptotic security, as well as the protocol with entangled qubits.
Abstract. In this paper, the systematisation and classification of modern quantum technologies of information security against cyber-terrorist attack are carried out. The characteristic of the basic directions of quantum cryptography from the viewpoint of the quantum technologies used is given. A qualitative analysis of the advantages and disadvantages of concrete quantum protocols is made. The current status of the problem of practical quantum cryptography use in telecommunication networks is considered. In particular, a short review of existing commercial systems of quantum key distribution is given.Keywords: information security, quantum technologies, quantum key distribution, quantum secure direct communication, quantum secret sharing, quantum stream cipher, quantum digital signature, quantum steganography.
In this paper the non-quantum method of security amplification for the ping-pong protocol with manyqubit entangled Greenberger-Horne-Zeilinger states (GHZ-states) is proposed. This method can be used in quantum Ukrainian Scientific Journal of Information Security, 2012 №2 (18) 85 cryptography and consists in invertible hashing of classical message blocks. The necessary sizes of matrices for hashing of message blocks are calculated at some values of the protocol parameters. The proposed method does not require the presence from legitimate users of any pre-established keys. Thus, the main advantage of the quantum secure direct communication protocols, namely the lack of necessity to distribute of secret key remains valid at usage of the proposed method.
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