Signature Verification

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Signature Verification

• By Mayura Worlikar
• COSC 5010

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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.

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Why Handwritten Signature only?

• Everyday transaction
• Individuals less likely to object
• Individuals signature is unique
• Less controversial

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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

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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 persons signature is
  never entirely the same. The signature can vary
  substantially over an individuals lifetime.
  Allowing for these variations while providing
  protection against forgers is a challenging task.

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Some theory

• Signature Acquisition
• Signature Identification using global features
• average pressure
• pen tilt
• average velocity
• Number of pen ups
• Training

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Signature Identification
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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.

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References

• http//www.gaits.com/biometrics_signature.asp
• http//www.vision.caltech.edu/mariomu/research/sig
  verif/
• Dynamic Signature Verification using Local and
  Global Features
• ------ By Charles Pippin