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The paper is withdrawn due to an error in Section 2.

This paper has been withdrawn by the author, due to an error in relation (11).

This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

This paper has been withdrawn by the author(s).The scheme presented is insecure.

This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

This paper has been withdrawn by the authors.

This paper has been withdrawn by the author for further investigation.

This paper has been withdrawn by the author due to a mistake in the proof of the main theorem.

This paper has been withdrawn.

This paper has been withdrawn: it does not evade the no-go results of Mayers, Lo and Chau, to whom I am most grateful for helpful correspondences.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author because Lemma 3 is incorrect. This mistake is crucial in this paper.

This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.

This paper has been withdrawn by the author.

This paper has been withdrawn

This manuscript has been withdrawn at 17 April, 2007.

This preprint has been withdrawn as crucial errors have been discovered in the papers it has referred to. It is now superseded by cond-mat/9807391.