الفهرس 
Image EncryptionOnly 14 pages are availabe for public view
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Abstract
Optical scrambling or encryption is a new evolving trend that relates
optical systems with image processing. Optical encryption appeared in 1995
by Javidi and Refregier, who invented the Double Random Phase Encoding
(DRPE) algorithm. Since this date, different variants of optical encryption
have been presented in the literature. These variants have formed different
applications. This Thesis is concerned with the application of optical
encryption or scrambling in securing biometrics. A framework is presented
in this thesis for multi-biometric compression and encryption with DRPE.
The objective of this framework is to generate cancelable templates for users
in order to secure their biometrics from being hacked. The biometric
verification at the receiver side is performed on each biometric separately
with a cepstral approach due to the irreversibility of the Mel-Frequency
Cepstral Coefficients (MFCCs). Majority voting can be used as a tool for
obtaining solid decisions about the obtained biometrics. The main advantage
of this framework is twofold: compression of multiple biometrics in single
templates to save communication resources or storage space and encryption
of biometric templates to enhance the security level. Moreover, Optical
Scanning Holography (OSH), which is also dependent on optical
components such as mirrors and lenses, is used to build another cancellable
multi-biometric scheme. Simulation results prove that the two proposed
cancelable multi-biometric schemes based on optical scrambling techniques
succeed in securing biometrics, efficiently.