scholarly journals Combating Spam and Denial-of-Service Attacks with Trusted Puzzle Solvers

Author(s):  
Patrick P. Tsang ◽  
Sean W. Smith
2001 ◽  
Author(s):  
David Mankins ◽  
Rajesh Krishnan ◽  
Ceilyn Boyd ◽  
John Zao ◽  
Michael Frentz

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