Related papers: The four-qubit singlet state and decoherence-free …

This paper has been withdrawn by the authors due to substantial changes.

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This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

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This paper is withdrawn by the authors.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author, due to an error in relation (11).

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This paper has been withdrawn by the author due to some problems.

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This paper has been withdrawn by the author.

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This paper has been withdrawn for the reasons mentioned in the Comments.

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This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis.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.