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This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

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This paper has been withdrawn by the authors due to several major changes in concepts and results. New version will follow briefly as a new e-print.

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This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.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This paper has been withdrawn by the author because overcame by arXiv:0910.4694

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