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This paper has been withdrawn by the author(s), due to double submission. You can find it under: physics/0208019

This paper has been withdrawn.

This paper has been withdrawn

This paper has been withdrawn by the corresponding author because the newest version is now published in Discrete Applied Mathematics.

This paper has been withdrawn by the authors. This is due to the fact that it has been substantially revised. As a consequence title and aim of the contents

This paper was withdrawn on 20.11.97.

This paper has been withdrawn by the author due to the incorrect argument for the security.

This paper has been withdrawn by the author

This paper has been withdrawn by the authour.

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to some problems.

This paper has been withdrawn by the author.

This paper has been withdrawn.

This article has been withdrawn.

The paper has been withdrawn by the author because the result obtained has been reported earlier by other authors.

This paper is withdrawn

This paper has been withdrawn by the author as a major revision is made and a new version is uploaded at arXiv:0812.3120

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the authors. I will do the major revision.