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This paper considers the problem of security in practical implementation of Quantum Key Agreement applying the concept of Information Reconciliation and Privacy Amplification targeted towards the computer science community. Firstly, a scheme is proposed which is operable in presence of noise using procedure called 'Entanglement purification' on Bell states to detect presence of adversary and then a protocol that minimizes the entropy loss and thus increasing the length of shared key between two communicating parties in presence of active computationally unbounded adversary.
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