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This paper has been withdrawn.

Major mistake. The paper has been withdrawn.

The paper has been withdrawn

The paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the corresponding author because the newest version is now published in Journal of Discrete Algorithms.

This paper has been withdrawn

This paper has been withdrawn.

The paper has been withdrawn.

This paper is withdrawn.

This paper has been withdrawn by the authors

This paper has been withdrawn by the author due to serious error found in main argument.

This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

This paper was withdrawn by the authors.

This paper has been withdrawn by the author due to a missing figure

This paper has been withdrawn by the author because overcame by arXiv:0910.4694

This paper has been withdrawn by the author due to the incorrect argument for the security.

Although the results are correct, it was pointed out that the results follow from some previously known results. Accordingly, this version of the paper is withdrawn by the authors.

This paper has been withdrawn by the author due to its publication

This submission has been withdrawn at the request of the author.