The file "ecdl" is a binary executable for Linux on x86 compatible chips. It was compiled on RedHat 5.2 with: gcc ecdl2-97.c -o ecdl -O3 -fomit-frame-pointer -DPARAL=20 -static strip ecdl It is quite big at 119 K but there is a compressed 55 K version in "ecdl.gz". It runs at 112 k iterations per second on a 450 MHz Pentium II. Download, gunzip if necessary, do "chmod u+x ecdl" and run with arguments like this: ecdl { } : Either test, mail, alt or batch. : Something to identify you by e.g., your email address. : Name of the team you are on e.g., one you just made up! : The machine name. : The machine hardware type e.g, '450 MHz Pentium II'. : The OS name e.g., Linux. : Optional extra text. Please see sections 3 and 4 of the readMe in source/32-bit/ for more detailed info. Rob.