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Submitted on: 19 April 1998.
Revised on: 16 June 1998.
Accepted on: 22 July 1998.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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Submitted on: 03 July 2012.
Revised on: 23 August 2012.
Accepted on: 12 October 2012.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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Submitted on: 08 April 2011.
Revised on: 09 June 2011.
Accepted on: 02 July 2011.
___________________JOURNAL OF CRYPTOLOGY---SPRINGER
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