Search results for: P. Caballero-Gil

Items from 1 to 20 out of 36 results

chapter

Enhancing Collaboration in Vehicular Networks

J. Molina-Gil, P. Caballero-Gil, C. Caballero-Gil

Lecture Notes in Computer Science > Cooperative Design, Visualization, and Engineering > Cooperative Applications > 77-80

A VANET (Vehicular Ad-hoc NETwork) is an ad-hoc network that allows providing communications among nearby vehicles and between vehicles and nearby fixed roadside equipment. In these networks, warning messages affect decisions taken by drivers, so it is necessary the existence of a scheme to determine whether the road traffic information available to the driver is trustful or not. Besides, the quality...

chapter

Data Aggregation Based on Fuzzy Logic for VANETs

P. Caballero-Gil, J. Molina-Gil, C. Caballero-Gil

Lecture Notes in Computer Science > Computational Intelligence in Security for Information Systems > Chapter 1: Machine Learning and Intelligence > 33-40

Data aggregation is mainly used to combine similar or equal information sent by different nodes of a network before forwarding it with the aim of reducing the number of messages. This is particularly important in Vehicular Ad-hoc NETworks (VANETs) where vehicles broadcast information about the road traffic situation, what can lead to overload the network. In this paper we propose a system for data...

chapter

An EXperimental Hybrid wIrelesS platform for vehicular networks

F. Martin-Fernandez, P. Caballero-Gil, C. Caballero-Gil

2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM) > 1 - 3

2016 IEEE 17th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)

The need to improve road traffic management is evident worldwide. Growing congestions on the roads along with a gradual increase of pollution and concern for improving traffic safety have prompted to explore the potential of the Intelligent Transportation Systems through numerous research projects funded by public entities and/or the automotive industry. However, due to various reasons, including...

chapter

Cooperation Enforcement Schemes in Vehicular Ad-Hoc Networks

C. Hernández-Goya, P. Caballero-Gil, J. Molina-Gil, C. Caballero-Gil

Lecture Notes in Computer Science > Computer Aided Systems Theory - EUROCAST 2009 > Mobile and Autonomous Systems: Robots and Cars > 429-436

Vehicular Ad-hoc NETworks (VANETs) will provide many interesting services in the near future. One of the most promising is commercial application. In such a case, there will be necessary to motivate drivers to cooperate and contribute to packet forwarding in Vehicle-TO-Vehicle and Vehicle-TO-Roadside communications. This paper examines the problem, analyzes the drawbacks of known schemes, and proposes...

chapter

On the Use of Linear Cellular Automata for the Synthesis of Cryptographic Sequences

A. Fúster-Sabater, P. Caballero-Gil, O. Delgado

Lecture Notes in Computer Science > Hybrid Artificial Intelligence Systems > Learning Systems, Algorithms and Applications > 475-482

This work shows that a class of cryptographic sequences, the so-called interleaved sequences, can be generated by means of linear hybrid cellular automata. More precisely, linear multiplicative polynomial cellular automata generate all the components of this family of interleaved sequences. As an illustrative example, the linearization procedure of the self-shrinking generator is described. In this...

chapter

A Simulation Study of New Security Schemes in Mobile Ad-Hoc NETworks

P. Caballero-Gil, C. Caballero-Gil, J. Molina-Gil, A. Quesada-Arencibia

Lecture Notes in Computer Science > Computer Aided Systems Theory – EUROCAST 2007 > Systems Theory and Simulation: Formal Approaches > 73-81

This work provides both a new global authentication system for Mobile Ad-hoc NETworks and a study of its simulation with NS-2. The proposed scheme is constructed in a self-organizing manner, which implies the fulfillment of most requirements for this type of networks, such as adaptation to the changing topology of the network, public availability of broadcast communications and strength of access...

chapter

Application of Linear Hybrid Cellular Automata to Stream Ciphers

A. Fúster-Sabater, P. Caballero-Gil, M. E. Pazo-Robles

Lecture Notes in Computer Science > Computer Aided Systems Theory – EUROCAST 2007 > Cellular Automata > 564-571

Binary sequences generated by a class of linear cellular automata (the so-called multiplicative polynomial cellular automata) can be written as solutions of linear difference equations. At the same time, such solutions equal the output sequences of well known LFSR-based keystream generators. Cryptographic properties of the sequences generated by multiplicative polynomial cellular automata have been...

chapter

Linear Span analysis of a set of periodic sequence generators

P. Caballero-Gil, A. Fúster-Sabater

Lecture Notes in Computer Science > Cryptography and Coding > 22-33

An algorithm for computing lower bounds on the global linear complexity of nonlinearly filtered PN-sequences is presented. Unlike the existing methods, the algorithm here presented is based on the realization of bit wise logic operations. The numerical results obtained are valid for any nonlinear function with a unique term of maximum order and for any maximal-length LFSR. To illustrate the power...

chapter

Linearization of Stream Ciphers by Means of Concatenated Automata

A. Fúster-Sabater, P. Caballero-Gil

Lecture Notes in Computer Science > Computational Science and Its Applications – ICCSA 2007 > General Track > 544-554

Binary sequences generated by a class of linear cellular automata (multiplicative polynomial cellular automata) can be written as solutions of linear difference equations. At the same time, such solutions equal the output sequences from well known LFSR-based stream ciphers. These simple linear automata easily model complex nonlinear cryptographic generators. The modelling technique is based on the...

chapter

Efficient Application of Hybrid 150/90 Cellular Automata to Symmetric Cryptography

A. Fúster-Sabater, P. Caballero-Gil, M. E. Pazo-Robles

Lecture Notes in Computer Science > Computational Science – ICCS 2006 > Modelling of Complex Systems by Cellular Automata (MCSCA 2006) > 337-344

In this work, it is shown that a wide class of nonlinear sequence generators, the so called interleaved sequence generators, can be modelled in terms of linear cellular automata. A simple modelling procedure based on the concatenation of automata has been derived. The cryptographic characteristics of the generated sequences (period, linear complexity, number of different sequences) have been also...

chapter

A Zero-Knowledge Identification Scheme Based on an Average-Case NP-Complete Problem

P. Caballero-Gil, C. Hernández-Goya

Lecture Notes in Computer Science > Computer Network Security > Cryptography > 289-297

The present work investigates the possibility of designing zero-knowledge identification schemes based on hard-on-average problems. It includes a new two-party identification protocol whose security relies on a problem classified as DistNP-Complete under the average-case analysis, the so-called Distributional Matrix Representability Problem. One of the most critical questions in cryptography is referred...

chapter

Cryptanalytic Attack on Cryptographic Sequence Generators: The Class of Clock-Controlled Shrinking Generators

A. Fúster-Sabater, P. Caballero-Gil

Lecture Notes in Computer Science > Computational Science and Its Applications – ICCSA 2008 > General Track on Computational Methods, Algorithms and Applications > 668-679

The shrinking generator is a very popular sequence generator with cryptographic applications. Nowadays, it is still considered as a secure keystream generator. In this work, it is shown that the knowledge of only a low number of generated bits is sufficient to break it. Indeed, whereas the linear complexity of the generated sequence (the shrunken sequence) is bounded by A ·2^{(S − 2)} < LC ≤ A ·2⁽...

chapter

Deterministic Computation of Pseudorandomness in Sequences of Cryptographic Application

A. Fúster-Sabater, P. Caballero-Gil, O. Delgado-Mohatar

Lecture Notes in Computer Science > Computational Science – ICCS 2009 > Short Papers > 621-630

An easy method of checking balancedness degree as well as run quantification in sequences obtained from LFSR-based keystream generators has been developed. The procedure is a deterministic alternative to the traditional application of statistical tests. The computation method allows one to check deviation of balancedness and run distribution goodness from standard values. The method here developed...

chapter

Cooperative Security Schemes for Mobile Ad-Hoc Networks

P. Caballero-Gil, C. Hernández-Goya

Lecture Notes in Computer Science > Cooperative Design, Visualization, and Engineering > 286-294

The existence of selfish nodes, who do not cooperate in routing and forwarding, is one of the most critical problems for the applicability of Mobile Ad-hoc NETworks (MANETs). In this paper we propose several novel currency-based methods for stimulating cooperation among nodes of a MANET. In particular, the proposed protocols allow improving different aspects of previous schemes based on virtual currency...

chapter

Group Formation through Cooperating Node in VANETs

C. Caballero-Gil, P. Caballero-Gil, J. Molina-Gil

Lecture Notes in Computer Science > Cooperative Design, Visualization, and Engineering > Cooperative Applications > 105-108

Vehicular Ad Hoc Networks (VANETs) will play a vital role in the future road safety and comfort. The lack of centralized infrastructure and high node mobility and number of vehicles generate problems such as interrupting connections, difficult routing, security of communications and scalability. Groups are here proposed as a solution to avoid data collisions by decreasing the number of connections...

chapter

Distributed Communication System for Emergencies

I. Santos-Gonzalez, P. Caballero-Gil, A. Rivero-Garcia, C. Hernandez-Goya

2016 24th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP) > 309 - 312

2016 24th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP)

Nowadays, most communications are centralized. In emergency or catastrophic situations, this could be a problem because common communication infrastructures could collapse or become unavailable. This is exactly the case of mobile communications because they depend on network infrastructures that can fail due to natural disasters, terrorist attacks or huge people agglomerations. This work proposes...

chapter

Distributed Communication System for Emergencies

I. Santos-Gonzalez, P. Caballero-Gil, A. Rivero-Garcia, C. Hernandez-Goya

2016 24th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP) > 309 - 312

2016 24th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP)

chapter

Strong authentication on smart wireless devices

V. Mora-Afonso, P. Caballero-Gil, J. Molina-Gil

Second International Conference on Future Generation Communication Technologies (FGCT 2013) > 137 - 142

2013 Second International Conference on Future Generation Communication Technology (FGCT)

The rapid deployment of wireless technologies has given rise to the current situation where mobile phones and other wireless devices have become essential elements in all types of activities, including in the home. In particular, smartphones and laptops are used for wirelessly sharing photos and documents, playing games, browsing websites, and viewing multimedia, for example. This work describes a...

article

Chaotic modelling of the generalized self-shrinking generator

A. Fúster-Sabater, P. Caballero-Gil

Applied Soft Computing > 2011 > 11 > 2 > 1876-1880

In this paper, a method of obtaining cryptographic sequences based on discrete time chaotic dynamical systems is presented. The importance of the proposal is due to that such cryptographic sequences are also output sequences of a nonlinear keystream generator known as generalized self-shrinking generator, which is still considered secure for symmetric cryptography. It is remarkable that the linearity...

article

Analysis of the generalized self-shrinking generator

A. Fúster-Sabater, P. Caballero-Gil

Computers and Mathematics with Applications > 2011 > 61 > 4 > 871-880

This work shows that the output sequences of a well-known cryptographic generator, the so-called generalized self-shrinking generator, are particular solutions of homogeneous linear difference equations with binary coefficients. In particular, all those generated sequences are just linear combinations of primary sequences weighted by binary values. Furthermore, the complete class of solutions of these...

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INFONA - science communication portal

Search results for: P. Caballero-Gil

Enhancing Collaboration in Vehicular Networks

Data Aggregation Based on Fuzzy Logic for VANETs

An EXperimental Hybrid wIrelesS platform for vehicular networks

Cooperation Enforcement Schemes in Vehicular Ad-Hoc Networks

On the Use of Linear Cellular Automata for the Synthesis of Cryptographic Sequences

A Simulation Study of New Security Schemes in Mobile Ad-Hoc NETworks

Application of Linear Hybrid Cellular Automata to Stream Ciphers

Linear Span analysis of a set of periodic sequence generators

Linearization of Stream Ciphers by Means of Concatenated Automata

Efficient Application of Hybrid 150/90 Cellular Automata to Symmetric Cryptography

A Zero-Knowledge Identification Scheme Based on an Average-Case NP-Complete Problem

Cryptanalytic Attack on Cryptographic Sequence Generators: The Class of Clock-Controlled Shrinking Generators

Deterministic Computation of Pseudorandomness in Sequences of Cryptographic Application

Cooperative Security Schemes for Mobile Ad-Hoc Networks

Group Formation through Cooperating Node in VANETs

Distributed Communication System for Emergencies

Distributed Communication System for Emergencies

Strong authentication on smart wireless devices

Chaotic modelling of the generalized self-shrinking generator

Analysis of the generalized self-shrinking generator

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