Numerous methods have been recently proposed in the
literature for the encryption of 2-D information using optical
systems based on the Fractional Fourier Transform.
Encryption is one of the well known techniques to provide
security in transmission of multimedia contents over the
internet and wireless networks. There is a vast use of image
in all areas so its security is of great concern nowadays.
Discrete Fractional Fourier Transform (DFRFT) generalization
of the Discrete Fourier transform (DFT) with an additional
parameter is incorporated in image encryption to achieve a
more robust encryption system. To focus on security aspect,
in this paper a novel method of image encryption has been
proposed based on discrete Fractional Fourier Transform
(DFRFT), using exponential random phase mask. Encryption
with this technique makes it almost impossible to retrieve an
image without using both the correct keys. The technique
has been implemented experimentally and parameters like
security, sensitivity and mean square error (MSE) are
discussed.
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