34 research outputs found

    Ring-LWE:applications to cryptography and their efficient realization

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    © Springer International Publishing AG 2016. The persistent progress of quantum computing with algorithms of Shor and Proos and Zalka has put our present RSA and ECC based public key cryptosystems at peril. There is a flurry of activity in cryptographic research community to replace classical cryptography schemes with their post-quantum counterparts. The learning with errors problem introduced by Oded Regev offers a way to design secure cryptography schemes in the post-quantum world. Later for efficiency LWE was adapted for ring polynomials known as Ring-LWE. In this paper we discuss some of these ring-LWE based schemes that have been designed. We have also drawn comparisons of different implementations of those schemes to illustrate their evolution from theoretical proposals to practically feasible schemes

    Comparative chromosome painting discloses homologous Segments in distantly related mammals

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    Comparative chromosome painting, termed ZOO-FISH, using DNA libraries from flow sorted human chromosomes 1,16,17 and X, and mouse chromosome 11 discloses the presence of syntenic groups in distantly related mammalian Orders ranging from primates (Homo sapiens), rodents (Mus musculus), even-toed ungulates (Muntiacus muntjak vaginalis and Muntiacus reevesi) and whales (Balaenoptera physalus). These mammalian Orders have evolved separately for 55-80 million years (Myr). We conclude that ZOO-FISH can be used to generate comparative chromosome maps of a large number of mammalian species

    Managerial power in the German model: the case of Bertelsmann and the antecedents of neoliberalism

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    Our article extends the research on authoritarian neoliberalism to Germany, through a history of the Bertelsmann media corporation – sponsor and namesake of Germany’s most influential neoliberal think-tank. Our article makes three conceptual moves. Firstly, we argue that conceptualizing German neoliberalism in terms of an ‘ordoliberal paradigm’ is of limited use in explaining the rise and fall of Germany’s distinctive socio-economic model (Modell Deutschland). Instead, we locate the origins of authoritarian tendencies in the corporate power exercised by managers rather than in the power of state-backed markets imagined by ordoliberals. Secondly, we focus on the managerial innovations of Bertelsmann as a key actor enmeshed with Modell Deutschland. We show that the adaptation of business management practices of an endogenous ‘Cologne School’ empowered Bertelsmann’s postwar managers to overcome existential crises and financial constraints despite being excluded from Germany’s corporate support network. Thirdly, we argue that their further development in the 1970s also enabled Bertelsmann to curtail and circumvent the forms of labour representation associated with Modell Deutschland. Inspired by cybernetic management theories that it used to limit and control rather than revive market competition among its workforce, Bertelsmann began to act and think outside the postwar settlement between capital and labour before the settlement’s hotly-debated demise since the 1990s

    Compact Ring-LWE Cryptoprocessor

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    Abstract. In this paper we propose an efficient and compact processor for a ring-LWE based encryption scheme. We present three optimizations for the Num-ber Theoretic Transform (NTT) used for polynomial multiplication: we avoid pre-processing in the negative wrapped convolution by merging it with the main algo-rithm, we reduce the fixed computation cost of the twiddle factors and propose an advanced memory access scheme. These optimization techniques reduce both the cycle and memory requirements. Finally, we also propose an optimization of the ring-LWE encryption system that reduces the number of NTT operations from five to four resulting in a 20 % speed-up. We use these computational optimiza-tions along with several architectural optimizations to design an instruction-set ring-LWE cryptoprocessor. For dimension 256, our processor performs encryp-tion/decryption operations in 20/9 ”s on a Virtex 6 FPGA and only requires 1349 LUTs, 860 FFs, 1 DSP-MULT and 2 BRAMs. Similarly for dimension 512, the processor takes 48/21 ”s for performing encryption/decryption operations and only requires 1536 LUTs, 953 FFs, 1 DSP-MULT and 3 BRAMs. Our pro-cessors are therefore more than three times smaller than the current state of the art hardware implementations, whilst running somewhat faster

    Privacy-Enhanced Machine Learning with Functional Encryption

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    Functional encryption is a generalization of public-key encryption in which possessing a secret functional key allows one to learn a function of what the ciphertext is encrypting. This paper introduces the first fully-fledged open source cryptographic libraries for functional encryption. It also presents how functional encryption can be used to build efficient privacy-enhanced machine learning models and it provides an implementation of three prediction services that can be applied on the encrypted data. Finally, the paper discusses the advantages and disadvantages of the alternative approach for building privacy-enhanced machine learning models by using homomorphic encryption

    NanoprĂ€gen in Polymerfolien als Fertigungsverfahren fĂŒr fluidische Mikro Nano Systeme Nanoembossing in Polymer Foils as a Fabrication Technique for fluidic Micro Nano Systems

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    Um die FunktionalitĂ€t der Mikrosystemtechnik durch die Integration von Submikrometer und Nanometerstrukturen in sogenannte Mikro Nano Systeme erweitern zu können, mĂŒssen industriekompatible Produktionstechnologien entwickelt werden, die eine Strukturierung im Mikro und Nanometerbereich fĂŒr ein breites Nutzerspektrum ermöglichen und fĂŒr eine Fertigung von mikro und nanostrukturierten Komponenten auch im industriellen Einsatz in Frage kommen. Die Intention der vorliegenden Arbeit ist es, fĂŒr diese technologische Aufgabenstellung einen möglichen Lösungsansatz durch Untersuchungen zum NanoprĂ€gen als ein fĂŒr die Nanostrukturierung von Kunststoffen adaptiertes HeissprĂ€geverfahren weiterzuentwickeln und den enormen Nutzen des Verfahrens fĂŒr die Fertigung fluidischer Mikro Nano Systeme durch Applikationsbeispiele aus dem Bereich der Life Sciences zu veranschauliche

    Integration of moth eye structures into a poly dimethylsiloxane stamp for the replication of functionalized microlenses using UV nanoimprint lithography

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    The increasing demand for low cost camera modules for mobile devices requires technological solutions for the manufacturing process. One of the most promising fabrication processes for microlenses for camera modules is UV nanoimprint lithography. In a typical fabrication process, an elastomer stamp is used to replicate microlenses. In this work, a method is presented to integrate moth eye structures as an antireflective layer into a poly dimethylsiloxane PDMS stamp containing a microlens array. The integration of these structures is done by a thermoforming process. Due to the integration of the moth eye structures into the PDMS stamp, the optical performance of the replicated microlenses can be improved and no additional processing steps are necessary after the replication proces
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