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This paper has been withdrawn by the author, due to the insecurity against attacks received in quant-ph/0605027v5.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This paper has been withdrawn by the author, due to an error in the proof of Theorem 3.8.
This paper has been withdrawn by the author due to a crucial error in the submission action.
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This paper has been withdrawn by the author: it was a too preliminary version.
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This paper has been withdrawn by the author. A revised and expanded version is gr-qc/9907028 (Phys.Rev. D60 (1999) 104043).
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