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This paper has been withdrawn by the author due to some errors.

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This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.

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The paper has been withdrawn by the author since the protocol is not new. It is just the oldest version of BB84.

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The article is taken out.

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This paper has been withdrawn by the author.