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Cryptography and Security: From Theory to Applications - Essays Dedicated to Jean-Jacques Quisquater on the Occasion of His 65th Birthday; 01/2012
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ABSTRACT: This paper proposes a systematic security evaluation of cryptographic hardware against C safe-error attacks. Using the graph representation of a design, we provide a simple and efficient method to detect possible C safe-errors. Exposing possible vulnerabilities at an early stage of a design process, this method avoids costly design re-spins and reduces time-to-market. As a proof of concept, we apply the method to two well-known exponentiation algorithms: square-and-multiply-always and the Montgomery ladder.
Hardware-Oriented Security and Trust (HOST), 2011 IEEE International Symposium on; 07/2011
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ABSTRACT: When using Elliptic Curve Cryptography (ECC) in constrained embedded devices such as RFID tags, López-Dahab's method along with the Montgomery powering ladder is considered as the most suitable method. It uses x-coordinate only for point representation, and meanwhile offers intrinsic protection against simple power analysis. This paper proposes a low-cost fault detection mechanism for Elliptic Curve Scalar Multiplication (ECSM) using the López-Dahab algorithm. Introducing minimal changes to the last round of the algorithm, we make it capable of detecting faults with a very high probability. In addition, by reusing the existing resources, we significantly reduce both performance losses and area overhead compared to other methods in this scenario. This method is suitable especially for constrained devices.
Design, Automation & Test in Europe Conference & Exhibition (DATE), 2011; 04/2011
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IACR Cryptology ePrint Archive. 01/2011; 2011:258.
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Integration. 01/2011; 44:280-289.
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Integration. 01/2011; 44:259-269.
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ABSTRACT: The present study focused on the antioxidant activities of aged oat (Avena sativa L.) vinegar. The antioxidant activities of oat and vinegar have been proved by many previous research studies. It should be noted that oat vinegar, as a novel seasoning, has antioxidant activity.
Oat vinegar showed stronger radical scavenging activities, reducing power, and inhibition of lipid peroxidation than rice vinegar. The concentrations of polyphenols and flavonoids in oat vinegar were higher than those in rice vinegar. Ethyl acetate extract of oat vinegar possessed the most varieties of phenolic acids and showed the strongest antioxidant activity compared with ethanol and water extracts. At suitable doses of oat vinegar, the malondialdehyde value was decreased, activities of superoxide dismutase and glutathione peroxidase were promoted, and hepatic damage induced by (60)Co gamma-irradiation was ameliorated in aging mice.
Oat vinegar manifested antioxidant activity which was stronger than that of rice vinegar in vitro and the same as that of vitamin E in vivo.
Journal of the Science of Food and Agriculture 08/2010; 90(11):1951-8. · 1.44 Impact Factor
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ABSTRACT: Implementations of cryptographic primitives are vulnerable to physical attacks. While the adversary only needs to succeed in one out of many attack methods, the designers have to consider all the known attacks, whenever applicable to their system, simultaneously. Thus, keeping an organized, complete and up-to-date table of physical attacks and countermeasures is of paramount importance to system designers. This paper summarizes known physical attacks and countermeasures on Elliptic Curve Cryptosystems. Instead of repeating the details of different attacks, we focus on a systematic way of organizing and understanding known attacks and countermeasures. Three principles of selecting countermeasures to thwart multiple attacks are given. This paper can be used as a road map for countermeasure selection in a first design iteration.
Hardware-Oriented Security and Trust (HOST), 2010 IEEE International Symposium on; 07/2010
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21st IEEE International Conference on Application-specific Systems Architectures and Processors, ASAP 2010, Rennes, France, 7-9 July 2010; 01/2010
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ABSTRACT: We studied the effects of isoflavones and peptides on antioxidant activities of bacterial-type douchi during fermentation. Radical scavenging activities increased with increasing fermentation time. Isoflavone conversion was not obvious, while soy protein hydrolyzed dramatically during fermentation. These results suggest that soybean peptides rather than isoflavones result in variations in antioxidant activity in bacterial-type douchi.
Bioscience Biotechnology and Biochemistry 12/2009; 73(12):2749-53. · 1.28 Impact Factor
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ABSTRACT: Antithrombotic activities, namely, in vitro platelet aggregation and in vivo pulmonary thrombosis, of the methanolic extract of aged vinegar were evaluated. The ability of the extract to inhibit platelet aggregation induced by adenosine diphosphate (ADP) and thrombin was concentration-dependent. IC(50) values for the inhibition of platelet aggregation induced by ADP and thrombin were 1.7 +/- 0.3 and 8.9 +/- 1.9 mg/mL, respectively. When administered orally at >100 mg/kg of body weight, the extract protected the rats against thrombotic death induced by collagen and epinephrine. Furthermore, the low molecular weight fraction of the extract showed strong fibrinolytic activity and altered coagulation parameters such as activated partial thromboplastin time (APTT), prothrombin time (PT), and throbin time (TT) in rat platelet. These results suggested that the antithrombotic ability of the vinegar extract corresponded to both antiplatelet and anticoagulation activities.
Journal of Agricultural and Food Chemistry 09/2009; 57(18):8683-7. · 2.82 Impact Factor
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Cryptographic Hardware and Embedded Systems - CHES 2009, 11th International Workshop, Lausanne, Switzerland, September 6-9, 2009, Proceedings; 01/2009
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Cryptographic Hardware and Embedded Systems - CHES 2009, 11th International Workshop, Lausanne, Switzerland, September 6-9, 2009, Proceedings; 01/2009
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ABSTRACT: In this paper we describe a low footprint implementation of hyperelliptic curve cryptography (HECC) for RFID tags. This HECC processor supports divisor multiplication on a hyperelliptic curve defined over GF(2<sup>83</sup>). We propose a unified GF(2<sup>m</sup>) multiplier/inverter (UMI) which is smaller than ALUs with separated multipliers and inverters. With the UMI divisor multiplications using affine coordinates can be efficiently supported. Since affine coordinates require less registers than projective coordinates, the size of register file is also reduced. We choose hyperelliptic curves defined with the h(x) = x and f(x) = x<sup>5</sup> + f<sub>3</sub>x<sup>3</sup> + x<sup>2</sup> + f<sub>0</sub>. The HECC processor, synthesized with 130 nm standard cell library, uses 14.5 kGates. It consumes 13.4 ¿W when running at 300 kHz. One divisor multiplication takes 450 ms, which makes our solution a feasible option for light-weight applications.
Proceedings of the 4th International Conference for Internet Technology and Secured Transactions, ICITST 2009, London, UK, November 9-12, 2009; 01/2009
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ABSTRACT: NTRU is a public-key cryptosystem based on the shortest vector problem in a lattice which is an alternative to RSA and ECC. This work presents a compact and low power NTRU design that is suitable for pervasive security applications such as RFIDs and sensor nodes. We have designed two architectures, one is only capable of encryption and the other one performs both encryption and decryption. The strategy for the designs includes clock gating of registers, operand isolation and precomputation. This work is also the first one to present a complete NTRU design with encryption/decryption circuitry. Our encryption-only NTRU design has a gate-count of 2.8 kgates and dynamic power consumption of 1.72 muW. Moreover, encryption-decryption NTRU design consumes about 6 muW dynamic power and consists of 10.5 kgates.
Application-Specific Systems, Architectures and Processors, 2008. ASAP 2008. International Conference on; 08/2008
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ABSTRACT: Modular multiplication and inversion are the essential operations in both elliptic curve cryptosystems (ECC) and hyperelliptic curve cryptosystems (HECC). In this paper, we describe a unified digit-serial multiplier/inverter in GF(2<sup>m</sup>). The inverter is based on a modified extended Euclidean algorithm (EEA). When choosing digit size to be w, this multiplier/inverter finishes one inversion in lceil2 m/wrceil clock cycles, or two multiplications in parallel in lceilm/wrceil clock cycles.
Hardware-Oriented Security and Trust, 2008. HOST 2008. IEEE International Workshop on; 07/2008
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19th IEEE International Conference on Application-Specific Systems, Architectures and Processors, ASAP 2008, July 2-4, 2008, Leuven, Belgium; 01/2008
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Arithmetic of Finite Fields, 2nd International Workshop, WAIFI 2008, Siena, Italy, July 6-9, 2008, Proceedings; 01/2008
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IEEE International Workshop on Hardware-Oriented Security and Trust, HOST 2008, Anaheim, CA, USA, June 9, 2008. Proceedings; 01/2008
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Proceedings of the IEEE Workshop on Signal Processing Systems, SiPS 2008, October 8-10, 2008, Washington, D.C. Metro Area, USA; 01/2008
