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This paper has been withdrawn by the author due to rewritting and skipping crucial sign errors.

This paper has been withdrawn by the author due to an error in the derivation.

This paper has been withdrawn by the authors due to some errors.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author: it was a too preliminary version.

This article is withdrawn because of a mistake in the main result of the paper.

This paper has been withdrawn by the author due to the incorrect argument for the security.

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This submission has been withdrawn at the request of the author.

This article has been withdrawn due to an error in a proof of the main result.

This paper was withdrawn (temporarily?) by the author since an error needs to be corrected.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This paper has been withdrawn by the author due to some errors.

This paper has been withdrawn by the author due to an error in the proof of Theorem 1.

This paper has been withdrawn.

This paper has been withdrawn by the author due to new results to be added.

This paper has been withdrawn by the author due to a crucial sign error in equation 1