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This paper is withdrawn due to some gaps in the proof

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This paper has been withdrawn by the author due to the incorrect argument for the security.

This paper has been withdrawn by the authors due to some technical problems in the paper.

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This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

This paper has been withdrawn by the author due to a crucial error in the last lines in the proof of Lemma 3.3.

This manuscript has been withdrawn due to less meaning.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This submission has been withdrawn by arXiv administrators as it is a machine-generated paper.

This paper has been withdrawn by the authors because the paper is largely revised and improved.

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The paper was withdrawn because of its significant overlap with a paper appeared recently.

This paper has been withdrawn by the author. The paper has been accepted for publication in Communications on Pure and Applied Mathematics.

This paper has been withdrawn.