A Flexible Crypto-system Based upon the REDEFINE Polymorphic ASIC Architecture

The highest levels of security can be achieved through the use of more than one type of cryptographic algorithm for each security function. In this paper, the REDEFINE polymorphic architecture is presented as an architecture framework that can optimally support a varied set of crypto algorithms without losing high performance. The presented solution is capable of accelerating the advanced encryption standard (AES) and elliptic curve cryptography (ECC) cryptographic protocols, while still supporting different flavors of these algorithms as well as different underlying finite field sizes. The compelling feature of this cryptosystem is the ability to provide acceleration support for new field sizes as well as new (possibly proprietary) cryptographic algorithms decided upon after the cryptosystem is deployed.Defence Science Journal, 2012, 62(1), pp.25-31, DOI:http://dx.doi.org/10.14429/dsj.62.143

High-performance biosensing systems based on various nanomaterials as signal transducers

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Hydrothermal synthesis of defect-induced pristine alpha-NaCe(WO4)(2): a novel material for solid state lighting and gas sensing

Triclinic NaCe(WO4)(2) with oxygen monovacancies and divacancies has been successfully prepared via a facile cetyltrimethyl ammonium bromide (CTAB)-assisted hydrothermal technique. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy have been employed to determine the unit cell and microstructure of the NaCe(WO4)(2). The oxygen vacancies, structural distortion etc. have been investigated using Fourier-transform infrared, Raman and X-ray photoelectron spectroscopies. The synthesized samples exhibit an intense blue emission at 434 nm due to the 5d-4f transition of Ce3+ within the CeO8 dodecahedra, while the emission at 485 nm is ascribed to the 5d-4f transition within CeO7. It has also been identified that two emissions at 451 and 520 nm come from CeO6. Additionally, we find that the temperature of the hydrothermal reaction guides the formation of CeO7 and CeO6. In contrast to a previous ethylenediamine tetraacetic acid (EDTA)-assisted synthesis of NaCe(WO4)(2) that results in a predominant green emission, our samples exhibit strong violet emissions indicating that less CeO7 and CeO6 is formed when using CTAB. We have also conducted ab initio calculations using density-functional theory, which reveals that the valence and conduction bands comprise of the O(2)p orbitals and a O(2)p-Ce 5d hybridization, respectively. The Ce(5)dz(2), 5dyz and 5dxz orbitals mostly facilitate the 5d-4f transition within the CeO7 and CeO6 polyhedra. Commission Internationale de I'Eclairage coordinates are found in the blue region with a correlated color temperature (CCT) of similar to 7715 K indicating the potential for a-NaCe(WO4)(2) to be used in cold solid state lighting applications. Finally, we also observe that the oxygen vacancies can act as active centers for the adsorption of molecular oxygen, which in consequence leads NaCe(WO4) 2 to have gas sensing properties

Fluorometric and isothermal titration calorimetric studies on binding interaction of a telechelic polymer with sodium alkyl sulfates of varying chain length

Steady-state fluorescence measurements and isothermal titration calorimetric experiments have been performed to study the interaction between a telechelic polymer, pyrene-end-capped poly(ethylene oxide) (PYPY), and sodium alkyl sulfate surfactants having decyl, dodecyl, and tetradecyl hydrocarbon tails. Fluorometric results suggest polymer-surfactant interaction in the very low range of polymer concentrations. The relative variation in the excimer to monomer pyrene emission intensities with varying surfactant concentration reveals that initial addition of surfactant favors intramolecular preassociation until the surfactant molecules start binding with the ethylene oxide (EO) chain. With the growing number of surfactant aggregates along the EO chain, the association becomes hindered due to the polyelectrolyte effect. The results from microcalorimetric titrations in the low concentration range of PYPY solution (~10-6 M) with alkyl sulfates suggest two kinds of surfactant-polymer interactions, one with the polymer hydrophobic end groups and the other with the ethylene oxide backbone. The overall polymer-surfactant interaction starts at a much lower surfactant concentration for the hydrophobically modified polymers compared to that in the case of unsubstituted poly(ethylene oxide) homopolymer. From the experiments critical aggregation concentration values and the second critical concentration where free micelles start forming have been determined. An endeavor has been made to unveil the mechanism underlying the corresponding associations of the surfactants with the polymer

A Flexible Crypto-system Based upon the REDEFINE Polymorphic ASIC Architecture

The highest levels of security can be achieved through the use of more than one type of cryptographic algorithm for each security function. In this paper, the REDEFINE polymorphic architecture is presented as an architecture framework that can optimally support a varied set of crypto algorithms without losing high performance. The presented solution is capable of accelerating the advanced encryption standard (AES) and elliptic curve cryptography (ECC) cryptographic protocols, while still supporting different flavors of these algorithms as well as different underlying finite field sizes. The compelling feature of this cryptosystem is the ability to provide acceleration support for new field sizes as well as new (possibly proprietary) cryptographic algorithms decided upon after the cryptosystem is deployed

Task Allocation of Safety-Critical Applications on Reconfigurable Multi-Core Architectures

With the onset of multi-core chips, the single-core market is closing down. Developing avionics systems hosted on multi-core chips that enforce safety-criticality constraints constitutes a challenge for the aerospace industry. This paper presents a reconfigurable multi-core architecture and studies its suitability for hosting safety-critical embedded applications. A task allocation algorithm for this specific architecture is proposed, and the last section demonstrates its behavior and analyzes its efficiency

Experimental Allocation of Safety-Critical Applications on Reconfigurable Multi-Core Architecture

Multi-core processors pervade numerous industries but they still represent a challenge for the aerospace industry, where strong certification of every components is required. One way to make them enforce safety-criticality constraints is to ensure reallocation of critical tasks on the chip when they are affected by hardware faults. This paper describes and compares different models of a task reallocation problem for a reconfigurable multi-core architecture. It also presents the first version of the macroscopic model made of Raspberry Pi that was built to represent the multi-core architecture and to test the task allocation algorithm on an actual system, showing the increased robustness that the reallocation algorithm enables while cores are made faulty