Browsing Electrical, Electronic and Communications Engineering Research Collection by Subject "Data encryption (Computer science)"

DSpace/Manakin Repository

You are here:
Research Repository UCD
>
College of Engineering & Architecture
>
School of Electrical, Electronic & Communications Engineering
>
Electrical, Electronic and Communications Engineering Research Collection
>
Browsing Electrical, Electronic and Communications Engineering Research Collection by Subject

Browsing Electrical, Electronic and Communications Engineering Research Collection by Subject "Data encryption (Computer science)"

Now showing items 1-6 of 6

Cryptanalysis of optical security systems with significant output images

Situ, Guohai ; Gopinathan, Unnikrishnan ; Monaghan, David S. ; Sheridan, John T. (Optical Society of America, 2007-08-01)

The security of the encryption and verification techniques with significant output images is examined by a known-plaintext attack. We introduce an iterative phase-retrieval algorithm based on multiple intensity measurements ...
Key-space analysis of double random phase encryption technique

Monaghan, David S. ; Gopinathan, Unnikrishnan ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2007-09-10)

We perform a numerical analysis on the double random phase encryption/decryption technique. The key-space of an encryption technique is the set of possible keys that can be used to encode data using that technique. In the ...
Optical image encryption by random shifting in fractional Fourier domains

Hennelly, Bryan M. ; Sheridan, John T. (Optical Society of America, 2003-02-15)

A number of methods have recently been proposed in the literature for the encryption of two-dimensional information by use of optical systems based on the fractional Fourier transform. Typically, these methods require ...
Polarization encoding and multiplexing of two-dimensional signals : application to image encryption

Gopinathan, Unnikrishnan ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2006-08-01)

We discuss an optical system that encodes an input signal to a polarization state, using a spatial light modulator (SLM). Using two SLMs the optical system multiplexes two 2D signals in the polarization domain, and we ...
Role of phase key in the double random phase encoding technique : an error analysis

Monaghan, David S. ; Situ, Guohai ; Gopinathan, Unnikrishnan ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2008-07-20)

We perform a numerical analysis of the double random phase encryption–decryption technique to determine how, in the case of both amplitude and phase encoding, the two decryption keys (the image- and Fourier-plane keys) ...
Statistical investigation of the double random phase encoding technique

Monaghan, David S. ; Gopinathan, Unnikrishnan ; Situ, Guohai ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2009-08-24)

The amplitude-encoding case of the double random phase encoding technique is examined by deﬁning a cost function as a metric to compare an attempted decryption against the corresponding original input image. For the case ...