3 research outputs found
Digital image scrambling using 2D cellular automata
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. A. L. A. Dalhoum et al., "Digital Image Scrambling Using 2D Cellular Automata", IEEE MultiMedia, vol. 19, no. 4 pp. 28 – 36, oct-dec. 2012A digital image scrambling method based on a 2D cellular automaton, specifically the well-known Game of Life, produces an effective image encryption technique.This work has been partially sponsored by the Spanish MICINN project TIN2011-28260-C03-0
Is the Multiverse Hypothesis capable of explaining the Fine Tuning of Nature Laws and Constants? The Case of Cellular Automata
The objective of this paper is analyzing to which extent the multiverse
hypothesis provides a real explanation of the peculiarities of the laws and
constants in our universe. First we argue in favor of the thesis that all
multiverses except Tegmark's > are too small to
explain the fine tuning, so that they merely shift the problem up one level.
But the > is surely too large. To prove this
assessment, we have performed a number of experiments with cellular automata of
complex behavior, which can be considered as universes in the mathematical
multiverse. The analogy between what happens in some automata (in particular
Conway's >) and the real world is very strong. But if the
results of our experiments can be extrapolated to our universe, we should
expect to inhabit -- in the context of the multiverse -- a world in which at
least some of the laws and constants of nature should show a certain time
dependence. Actually, the probability of our existence in a world such as ours
would be mathematically equal to zero. In consequence, the results presented in
this paper can be considered as an inkling that the hypothesis of the
multiverse, whatever its type, does not offer an adequate explanation for the
peculiarities of the physical laws in our world. A slightly reduced version of
this paper has been published in the Journal for General Philosophy of Science,
Springer, March 2013, DOI: 10.1007/s10838-013-9215-7.Comment: 30 pages, 16 figures, 5 tables. Slightly reduced version published in
Journal for General Philosophy of Scienc
Facial image encryption for secure face recognition system
A biometric authentication system is more convenient and secure than graphical or textual passwords when accessing information systems. Unfortunately, biometric authentication systems have the disadvantage of being susceptible to spoofing attacks. Authentication schemes based on biometrics, including face recognition, are susceptible to spoofing. This paper proposes an image encryption scheme to counter spoofing attacks by integrating it into the pipeline of Linear Discriminant Analysis (LDA) based face recognition. The encryption scheme uses XOR pixels substitution and cellular automata for scrambling. A single key is used to encrypt the training and testing datasets in LDA face recognition system. For added security, the encryption step requires input images of faces to be encrypted with the correct key before the system can recognize the images. An LDA face recognition scheme based on random forest classifiers has achieved 96.25% accuracy on ORL dataset in classifying encrypted test face images. In a test where original test face images were not encrypted with keys used for encrypted feature databases, the system achieved 8.75% accuracy only showing it is capable of resisting spoofing attacks