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The processor flaws used in the Spectre and Meltdown attacks have had uncharacteristically large media impact, even gaining coverage in main-stream media. This is despite the fact that this type of exploit has not been used in any real world attacks and is unlikely to target consumers, as simpler attack vectors still remain highly effective. However, because Spectre affects any processor which uses speculative execution, with little hope for a "silver bullet" in the near future, Spectre seems to be here to stay. While Spectre might not be very relevant to the consumer market, it is quite relevant where safety is usually paramount: the cloud. It promises cost reduction and safety through offloading maintenance and updating tasks to gigantic providers like Amazon’s AWS. But how secure can the most up-to-date platform be, if the used hardware is inherently flawed to the core? This paper provides a high level explanation of the Spectre attack, shows potential Spectre attack vectors in a shared cloud environment and discusses some defensive measures.
Using TaC filaments for a hot-wire chemical vapor deposition (HWCVD) compact material (substrate temperatures 220°C) and porous, non-compact or void-rich layers (120°C) were produced in a silane-hydrogen atmosphere in the pressure range from 1 Pa to 30 Pa. For high pressures the adhesion of the layers was weak. In this case the thus pulverized silicon particles could be removed from the substrate by an ultrasonic process in an isopropanol bath. The suspension of these silicon particles was spread to form a continuous film, namely a "particle-film".
The infrared (IR) spectra of the compact solid, the original porous layers and a series of temper stages of the particle-films are compared and discussed. The role of H and O atoms in the silicon network is investigated. Thus those structural properties, which may be found out by infrared tools, e.g. the bonding configurations of the Si related bonds of the said materials and some possible chemical reactions are explained.
In dieser Masterarbeit ist die Konzeption eines Blockchain-basierten Triple-A-Systems und die Implementierung einer Erweiterung des Extensible Authentication Protocols (EAP; deutsch: Erweiterbares Authentifizierungsprotokoll) [RFC3748] in Form einer EAP-Methode beschrieben.
Die EAP-Methode wird hierbei als Authentifizierungsprotokoll für den WLAN-Zugriff nach IEEE 802.1X [RFC3580] genutzt.
Die Blockchain Ethereum bildet dabei die Plattform für das Backend des Triple-A-Systems (AAA-Systems; Authentifizierungs-, Autorisierungs- und Abrechnungs-Systems), in Form eines Smart-Contracts.
