Signature Verification

By Mayura Worlikar

COSC 5010

Introduction

Computers are largely used in almost each and every field including financial transactions, thus providing additional security measures for computer system is necessary.

The security measures to be used must be cheap, reliable and un-intrusive to the authorized person. The technique which meets these requirements is handwritten signature verification.

Why Handwritten Signature only?

Everyday transactionIndividuals less likely to objectIndividual’s signature is uniqueLess controversial

Categories of signature Identification

Offline Signature Verification deals with shape only

Online signature Verification deals with dynamic features like speed, pen

pressure, directions, stroke length, and when the pen is lifted from the paper

Challenging task

The main challenge with online Signature Identification technology is differentiating between the consistent parts of the signature and the behavioral parts of the signature that vary with each signing . A person’s signature is never entirely the same. The signature can vary substantially over an individual’s lifetime. Allowing for these variations while providing protection against forgers is a challenging task.

Some theory

Signature AcquisitionSignature Identification using global features

average pressure pen tilt average velocity Number of pen ups

Training

Signature Identification

Advantages

Low error rate.Forgery is detected even when the forger has

managed to get a copy of the authentic signature.

Fast and simple training.Cheap hardware. Little storage requirements.

References

http://www.gaits.com/biometrics_signature.asp

http://www.vision.caltech.edu/mariomu/research/sigverif/

Dynamic Signature Verification using Local and Global Features

------ By Charles Pippin