Software implementation of Bechmann-Pasquinucci and Peres protocol for qutrits

The main goals of cryptography are for a sender and a receiver to be able to communicate in a way that is unintelligible to third parties, and for the authentication of messages to prove that they were not altered in transit. Both of these goals can be accomplished with provable security if sender and receiver are in possession of shared, the secret key. This paper presents a software-prototype of the Bechmann-Pasquinucci and Peres protocol for qutrits, on two cases: with and without cyber-attack (the Intercept-Resend attack). Presence of the enemy is determined by calculating the errors obtained at the end of transmission through quantum channel. The method Quantum Trit Error Rate (QTER) for detecting enemy can be applied to the majority key distribution systems, each system having its own acceptable error rate.