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Submitted on: 13 June 2004.
Revised on: 28 September 2004.
Accepted on: 17 November 2004.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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Submitted on: 19 February 2020.
Revised on: 11 March 2020.
Accepted on: 05 May 2020.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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Submitted on: 01 December 2002.
Revised on: 13 February 2003.
Accepted on: 09 April 2003.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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