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Submitted on: 12 September 2007.
Revised on: 06 November 2007.
Accepted on: 23 December 2007.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
Submitted on: 14 November 2005.
Revised on: 23 February 2006.
Accepted on: 22 March 2006.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
Submitted on: 01 February 1999.
Revised on: 25 February 1999.
Accepted on: 08 April 1999.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
Submitted on: 27 April 2008.
Revised on: 01 July 2008.
Accepted on: 28 July 2008.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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