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