set term png
set output "sign_keysize.png"
set xtics; set ytics
set grid xtics
set grid ytics
set mxtics; set mytics;
set xlabel "key size"
set ylabel "time taken to sign  (milliseconds)"
set xrange[512:1024]
set title "Time taken to sign a message as a function of key size; message size=1000 bytes"
plot "result.keysize.DSA.sign.dat" title "DSA signature" with linespoints, "result.keysize.RSA.sign.dat" title "RSA signature" with linespoints