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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author due to similarity to the author's other paper

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This paper has been withdrawn by the authors.

This paper has been withdrawn by the authors due to substantial changes.

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This paper has been withdrawn by the author(s). Please see arXiv:0711.3910 for revision.

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

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None. This paper has been withdrawn by the authors.

This paper was withdrawn by the authors.

This paper was withdrawn by the author.

This paper has been withdrawn by the author, because a better treatment is given in the author's Phd. thesis (Sections 3.4.6 and 4.4), now available on the arxiv.

This paper has been withdrawn by the authors, as it has been rejected in November 2007.