Use of md5sums.exe: the command md5sums -b -s collision1.bin collision2.bin should produce the following output: MD5sums 1.2 freeware for Win9x/ME/NT/2000/XP+ Copyright (C) 2001-2005 Jem Berkes - http://www.pc-tools.net/ collision1.bin c6b2fe88912770fc6f2db71f58c7d251 collision2.bin c6b2fe88912770fc6f2db71f58c7d251 2602 bytes, 0 ms = 0.00 MB/sec