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2008 Reports :  Cryptology ePrint Archive Forum
Discussion forum for Cryptology ePrint Archive reports posted in 2008. Please put the report number in the subject.  
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a question about "secure index paper" bye GOH
Posted by: fatima (IP Logged)
Date: 05 July 2008 06:13

I want a question about its security proof. What does "q" mean when we want to prove a method is (t,e,q)-secure.
and in the theorem 3.2 in this paper GOH has PROVE that if f is a (t, e, q)-psedo-random function, then z-idx is a (t, e, q/2)-IND_CKA index. How can we calculate q/2 ?
why is it q/2 ? Why is not is q ?

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