Related papers: Security bounds for the eavesdropping collective a…

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This paper has been withdrawn by the authors because the results obtained have been reported earlier by other authors.

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This paper has been withdrawn as it has been superseded by postings arXiv:quant-ph/0702147 and arXiv:0712.2935

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This paper is withdrawn. See quant-ph/9806031 for a discussion.

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This paper has been withdrawn by the author(s), due to some technical problem.

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This paper has been withdrawn by the author, as it is now incorporated in 0901.4506 (v4)

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This paper was withdrawn on 20.11.97.

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This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.