Gonzalo Álvarez Marañón

MAMA: MANIFEST ANALYSIS FOR MALWARE DETECTION IN ANDROID

The use of mobile phones has increased because they offer nearly the same functionality as a personal computer. In addition, the number of applications available for Android-based mobile devices has increased. Google offers programmers the opportunity to upload and sell applications in the Android Market, but malware writers upload their malicious code there. In light of this background, we present here manifest analysis for malware detection in Android (MAMA), a new method that extracts several features from the Android manifest of the applications to build machine learning classifiers and detect malware.

Trident, a New Pseudo Random Number Generator Based on Coupled Chaotic Maps

This article describes a new family of cryptographically secure pseudorandom number generators, based on coupled chaotic maps, that will serve as keystream in a stream cipher. The maps are a modification of a piecewise linear map, by dynamic changing of the coefficient values and perturbing its lesser significant bits.

A new secret sharing scheme for images based on additive 2-dimensional cellular automata

A new secret color image sharing scheme based on two-dimensional memory cellular automata, is proposed. Such protocol is of a (n,n)-threshold scheme where the secret image to be shared is considered as one of the initial configurations of the cellular automata. The original idea is to study how a reversible model of computation permits to compute the shares and then using the reverse computation in order to recover the original image. The scheme is proved to be perfect and ideal, and resistant to the most important attacks such as statistical attacks.

Graphic cryptography with pseudorandom bit generators and cellular automata

In this paper we propose a new graphic symmetrical cryptosystem in order to encrypt a colored image defined by pixels and by any number of colors. This cryptosystem is based on a reversible bidimensional cellular automaton and uses a pseudorandom bit generator. As the key of the cryptosystem is the seed of the pseudorandom bit generator, the latter has to be cryptographically secure. Moreover, the recovered image from the ciphered image has not loss of resolution and the ratio between the ciphered image and the original one, i.e., the factor expansion of the cryptosystem, is 1.