begin{algorithm}[tb]

scriptsize $prod_m$: Manipulated Call Trace,
scriptsize $prod_n$: Natural Call Trace     \
scriptsize $Delta_m$: Unaligned Call Trace in $prod_m$,
scriptsize $Delta_n$: Unaligned Call Trace in $prod_n$, \
scriptsize $f_{prod}$: $langle name,caller eip,parameter listrangle$,
scriptsize $f_{Delta}$: $langle name,parameter listrangle$

begin{algorithmic}[1]                   % enter the algorithmic environment
caption{Differential Analysis on the API-Call Traces}
label{algo:diff}
    $Delta_mleftarrow  emptyset$,$Delta_n leftarrow  emptyset$

FOR{call $f_{prod_m}$ in $prod_m$}{
    FOR{call $f_{prod_n}$ in $prod_m$}{
        IF {isAligned($f_{prod_m}$,$f_{prod_n}$)}{
         GOTO FIND_ALIGNED
        }
    }
 $Delta_m=Delta_m bigcup f_{Delta_m}$
}

 $Delta_n=prod_n$
 FIND_ALIGNED:
        $Delta_n= prod_m[0,index(f_{prod_n})]$
        ${f_{Delta_i}}$=Diff($Delta_m$,$Delta_n$)
    return ${f_{Delta_i}}$
    end{algorithmic}
end{algorithm}