Information-Theoretically Secure Secret-Key Agreement Based On Noisy Authentic Channels

Information-theoretically secure secret-key agreement is the key to make perfect security. The models of unconditional security from quantum channels and noisy channels are two typical methods now. Once the secret-key has been agreed over a public channel, one can use the key to encrypt messages by using one time pad. The main work in this thesis is as follows:1) A new information-theoretically seure channel model is proposed. In the new model, the legitimate partners can control the error bit rate of the eavesdropper's channel by adjusting their virtual binary symmetric channels. When our new model is implemented, the problem of receiving synchronization of the partners will not occur.2) A new information reconciliation protcol is presented. The efficiency of our new protocol is much higher than those of all known information reconciliation protocols even under the worst case, and simultaneously, its information leakage is relatively small.