Submitted on: 28 March 2003.
Revised on: 23 April 2003.
Accepted on: 29 May 2003.
___________________IEEE SECURITY & PRIVACY---IEEE COMPUTER SOC
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Submitted on: 31 July 2012.
Revised on: 16 September 2012.
Accepted on: 13 October 2012.
___________________IEEE SECURITY & PRIVACY---IEEE COMPUTER SOC
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Submitted on: 24 April 2018.
Revised on: 02 August 2018.
Accepted on: 14 August 2018.
___________________IEEE SECURITY & PRIVACY---IEEE COMPUTER SOC
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Submitted on: 15 February 2007.
Revised on: 26 March 2007.
Accepted on: 10 May 2007.
___________________IEEE SECURITY & PRIVACY---IEEE COMPUTER SOC
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