Browsing by Subject "Data encryption (Computer science)"

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Browsing by Subject "Data encryption (Computer science)"

Now showing items 1-11 of 11

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 ...
Gene Tagging and the Data Hiding Rate

Balado, Félix ; Haughton, David (The Institution of Engineering and Technology, 2012-06-28)

We analyze the maximum number of ways in which one can intrinsically tag a very particular kind of digital asset: a gene, which is just a DNA sequence that encodes a protein. We consider gene tagging under the most ...
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 ...
On the embedding capacity of DNA strands under insertion, deletion and substitution mutations

Balado, Félix (SPIE--The International Society for Optical Engineering, 2010-01)

A number of methods have been proposed over the last decade for embedding information within deoxyribonucleic acid (DNA). Since a DNA sequence is conceptually equivalent to a unidimensional digital signal, DNA data embedding ...
On the Shannon capacity of DNA data embedding

Balado, Félix (IEEE, 2010-03-14)

This paper firstly gives a brief overview of information embedding in deoxyribonucleic acid (DNA) sequences and its applications. DNA data embedding can be considered as a particular case of communications with or without ...
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 ...
Performance of DNA data embedding algorithms under substitution mutations

Haughton, David ; Balado, Félix (2010-12)

DNA data embedding is a relatively recent area which aims at embedding arbitrary information in deoxyribonucleic acid (DNA) strands. One interesting application of DNA data embedding can be tracing pathways of genetic ...
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 ...
Repetition coding as an effective error correction code for embedding information in DNA

Haughton, David ; Balado, Félix (IEEE, 2011-10-24)

The goal of DNA data embedding is to enable robust encoding of non-genetic information in DNA. This field straddles the areas of bioinformatics and digital communications, since DNA mutations can be seen as akin to a noisy ...
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 ...