Abstract: An automatic signature verification system is set forth that utilizes a main routine for comparing signatures using forensic hand writing methodology. A secondary program is used to modify the algorithms used by the main program for making adjustments thereto based on either additional data consisting of a plurality of genuine or authenticated signatures or changes in a persons signature due to aging or some other physical change resulting in a change in signature features. Over seventy thousand signatures can be verified in one hour using a single personal computer. In addition, authentic signature data having a resolution as low as 80 dpi can be used.