deletions | additions       diff --git a/Hash Functions.tex b/Hash Functions.tex  index 932fa2d..9a443d2 100644  --- a/Hash Functions.tex  +++ b/Hash Functions.tex 
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\begin{itemize}  \item Difficulty of inversion  \item A function $h$ is PIR if no efficient adversary program $A$ can invert $h$ on more htan a negligible # of outputs.  \item $h(x) = x^b$ mod $n$; $n=pq, b>1$. factorization unknown.  \end{itemize}  \item Collision Resisitance  \item Second Pre-Image Resistance