Fast, parallel and secure cryptography algorithm using Lorenz's attractor

A novel cryptography method based on the Lorenz's attractor chaotic system is presented. The proposed algorithm is secure and fast, making it practical for general use. We introduce the chaotic operation mode, which provides an interaction among the password, message and a chaotic system. It ensures that the algorithm yields a secure codification, even if the nature of the chaotic system is known. The algorithm has been implemented in two versions: one sequential and slow and the other, parallel and fast. Our algorithm assures the integrity of the ciphertext (we know if it has been altered, which is not assured by traditional algorithms) and consequently its authenticity. Numerical experiments are presented, discussed and show the behavior of the method in terms of security and performance. The fast version of the algorithm has a performance comparable to AES, a popular cryptography program used commercially nowadays, but it is more secure, which makes it immediately suitable for general purpose cryptography applications. An internet page has been set up, which enables the readers to test the algorithm and also to try to break into the cipher in

La imagen postmortem y el rito de los invitados: Un análisis de la escopía de la despedida

Es una buena descripción de la forma tradicional en la que regionalmente se organiza la ritualidad hacia la muerte, con un importante contenido analítico en torno a la cuestión de la muerte, desde la antropología y el psicoanálisis, principalmente como transdisciplinariedad con la que traban los estudios visuales.Es un trabajo terminal de grado en el cual se aborda la fotografía postmortem como una práctica que se mantiene socialmente, y que incluye actividades y formas de asumir el procesamiento de la pérdida en su relación con el manejo de las imágenes fotográficas

Fundamental Finite Key Limits for One-Way Information Reconciliation in Quantum Key Distribution

The security of quantum key distribution protocols is guaranteed by the laws of quantum mechanics. However, a precise analysis of the security properties requires tools from both classical cryptography and information theory. Here, we employ recent results in non-asymptotic classical information theory to show that one-way information reconciliation imposes fundamental limitations on the amount of secret key that can be extracted in the finite key regime. In particular, we find that an often used approximation for the information leakage during information reconciliation is not generally valid. We propose an improved approximation that takes into account finite key effects and numerically test it against codes for two probability distributions, that we call binary-binary and binary-Gaussian, that typically appear in quantum key distribution protocols

Gender differences evaluation in charity campaigns perception by measuring neurophysiological signals and behavioural data

Nowadays it has clearly understood that emotions play an important role in the success of commercial advertising. Particularly, it has been observed as advertising campaigns of non-profit organizations need to create an emotional appeal in people, in order to generate a positive behavioral response. The charity sector has grown tremendously in the last decades and with it the need to create improved specific marketing strategies. The aim of the present paper is to show how the variation of the EEG frontal cortical asymmetry is related to the general appreciation perceived during the observation of a charity campaign, focusing on gender differences. With the use of neurophysiological and traditional measures, the responses of participants are evaluated through an electroencephalographic (EEG) index of approach or withdrawal motivation based on the frontal alpha asymmetry, called ApproachWithdrawal Index (AW), and an autonomic index deriving from the combination of the heart rate (HR) and the galvanic skin response (GSR) activity, called Emotional Index (EI), considered an indicator of the emotional involvement. An interview at the end of each experience reveals the behavioral data. Results show higher values for women than men of both neurophysiological indexes: for the EI with p=0,037 and for the AW index with p=0,035. The declared answers of participants at the end of the campaign demonstrate that the declared liking of women is statistically significantly higher than the declared liking of men (p=0,008). Finally, there is a correlation between the AW and the declared liking with p=0,007. Results suggest the presence of gender differences in the cognitive and emotional responses to emotion appealing charity advertisements

Public policies and multilingualism in HCI

International audiencePublic policy plays an influential role in the work we do as HCI researchers, interaction designers, and practitioners. "Public policy," a broad term, includes both government policy and policy within non-governmental organizations. This forum focuses on topics at the intersection of human-computer interaction and public policy

Global corporate bond issuance: what role for US quantitative easing?

The paper investigates the impact of US quantitative easing (QE) on global non-financial corporate bond issuance. It distinguishes between two QE instruments, MBS/GSE debt and Treasury bonds, and disentangles between two channels of transmission of QE to global bond markets, namely flow effects (purchases) and stock effects (holdings). We control for a number of domestic and global macro-financial factors. In particular, we control for weaknesses in crossborder and domestic banking which might have induced the corporate sector to issue more bonds. The results indicate that US QE had a large impact on corporate bond issuance, especially in emerging markets, and that flow effects (i.e. portfolio rebalancing) were the main transmission channel of QE. A counterfactual analysis shows that bond issuance in emerging markets since 2009 would have been halved without QE