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Security Analysis of the Simple Lightweight Authentication Protocol

Security Analysis of the Simple Lightweight Authentication P...

引用

International Conference on Networking (ICN)

作者： Gyözö Gódor Sándor Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424460830

Radio frequency identification technology is becoming ubiquitous and, as an unfortunate side effect, more and more authentication solutions come to light that have plenty of security issues to deal with. In our former contribution, we introduced a solely hash-based secure authentication algorithm that is capable of providing protection against most of the well-known attacks and performs exceptionally well even in very large systems. We gave a theoretical analysis of the SLAP protocol from the point of view of security and performance. In this paper, we define the attacker model and we summarize the major security aspects in case of small computational capacity systems; furthermore we give a comparative table about some lightweight protocols' security features. Finally, we fully prove the correctness of the SLAP protocol with GNY logics.

关键词： Security Authentication Protocols Radiofrequency identification Performance analysis Logic Monitoring Cryptography Paper technology Environmental economics

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Algorithmic solution to superactivation of zero-capacity optical quantum channels

Algorithmic solution to superactivation of zero-capacity opt...

引用

IEEE PhotonicsGlobal@Singapore, IPGC

作者： L. Gyongyosi S. Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The superactivation of zero-capacity quantum channels makes it possible to use two zero-capacity quantum channels with a positive joint capacity at the output. Currently, we have no theoretical results for describing all possible combinations of superactive zero-capacity channels, hence there should be many possible - still undiscovered - combinations. Our method gives an algorithmic solution to the superactivation problem, and provides an efficient algorithmic solution for discovering “superactive” zero-capacity optical quantum channels. We analyze the superactivation property of the amplitude damping quantum channel model. This model has great importance in practical communications, since this channel model describes energy dissipation due to the noise of the optical channel. To discover these superactive zero-capacity channels, an extremely large set of possible quantum states has to be analyzed, however an efficient algorithmic framework is still missing for this purpose. We show a fundamentally new method of finding the conditions for “superactive” zero-capacity optical quantum channels.

关键词： Quantum computing Algorithm design and analysis Clustering algorithms Channel capacity Entropy Approximation algorithms Geometrical optics

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Analysing GOP structure and packet loss effects on error propagation in MPEG-4 video streams

Analysing GOP structure and packet loss effects on error pro...

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： Árpád Huszák Sándor Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Video streaming applications are commonly used in both wired and wireless environment; however, wireless links are burden by higher packet loss ratio and delay variation. In order to make video transmission possible in wireless networks MPEG video coding is usually used to reach the bandwidth constrains of the links. The video quality and compression ratio depends on Group of Pictures (GOP) structure, but it also affects the distortion sensitivity of the video stream due to packet losses. In this paper the correlation between GOP size, packet loss ratio and video quality is investigated. By increasing the distance between the reference frames the effectiveness of coding can be improved, but on the other hand the effect of error propagation due to packet losses also increases. Our aim was to find the optimal GOP structure to maximize the coding efficiency and minimize the quality distortion due to error propagation. We have implemented a simulation tool to make the analysis of differently structured video streams transmitted over lossy channels.

关键词： Propagation losses MPEG 4 Standard Streaming media Video compression Delay Wireless networks Transform coding Video coding Bandwidth Analytical models

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Application of partial reconfiguration of FPGAs in image processing

Application of partial reconfiguration of FPGAs in image pro...

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Ph.D. Research in Microelectronics and Electronics (PRIME)

作者： Tamás Raikovich Béla Fehér Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

FPGA based hardware accelerators have been more and more widely used in different kind of applications. As compared to other solutions and the direct hardware implementation, the advantage of the FPGA devices is their flexibility that arises from their programmable nature. In addition to this, some FPGA devices also support partial dynamic reconfiguration. When general purpose processors and reconfigurable computational structures are used together, the most advantageous properties of both components can be utilized. Algorithms (searching, sorting, signal and image processing, etc.) that are implemented such way have achieved 100 times or 1000 times better performance. This paper introduces a Xilinx Virtex-5 FPGA based reconfigurable hardware accelerator system, which has been created mainly for image processing purposes. By using the partial reconfiguration capability of the FPGA, the execution units in the system can be quickly reconfigured.

关键词： Finite impulse response filter Field programmable gate arrays Image processing Pixel Pipelines Hardware

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Investigating PCB traces for fine pitch applications

Investigating PCB traces for fine pitch applications

引用

International Symposium for Design and technology of Electronics Packages (SIITME)

作者： Attila Geczy Zsolt Illyefalvi-Vitez Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Surface mounted (SM) components are considered to be dominant in electronics technology. Fine pitch SM components are becoming common due to miniaturization tendencies. Ball Grid Array (BGA) components are classified as fine pitch, if the pitch is 1 mm (39 mil) or smaller [1]. These ICs desire careful approach in Printed Circuit Board (PCB) design. In order to compare the electrical performance of PCBs, two PCB interconnection boards were designed with different wiring patterns for a 650 μm pitch commercial BGA. A footprint-compatible dummy BGA was also designed, produced and used to form daisy chain with the PCB patterns. The inductance of the different geometries of the traces on the PCBs and the resistance - varying according to the skin effect at higher frequencies [2] - were calculated and verified by measurements. The skin effect was simulated by Finite Element Method (FEM). The influence of the PCB fabrication deviations was also studied.

关键词： Inductance Resistance Copper Skin effect Geometry Skin

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Novel geometrical solution to additivity problem of classical quantum channel capacity

Novel geometrical solution to additivity problem of classica...

引用

IEEE Princeton Section Sarnoff Symposium

作者： Laszlo Gyongyosi Sandor Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424455928;9781424455935

Quantum channel additivity is currently an active area of research in Quantum Information Theory. The additivity conjectures have emerged from an attempt to find a closed form expression for the capacity of a noisy quantum channel. To this day, strict additivity for quantum channel capacity has been conjectured, but not proven. The open questions related to additivity of quantum channel capacities can be discussed by our novel approach. We show an efficient computational geometric method to analyze the additivity property, using quantum Delaunay tessellation on the Bloch ball and quantum relative entropy as distance measure.

关键词： Channel capacity Quantum computing Entropy Quantum entanglement Relativistic quantum mechanics Quantum mechanics Telecommunication computing Information theory Noise measurement Data mining

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Investigating the mechanical strength of Vapor Phase soldered chip components joints

Investigating the mechanical strength of Vapor Phase soldere...

引用

International Symposium for Design and technology of Electronics Packages (SIITME)

作者： Olivér Krammer Tamás Garami Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In our experiment the mechanical strength of solder joints formed by Vapor Phase soldering was investigated. A testboard was designed, which allowed fifty pieces of 0603 size chip resistors to be placed. The soldering was carried out by infrared conventional reflow and by Vapor Phase reflow as well. After soldering the shear strength of joints formed by both of the soldering methods was measured, and the cross-section of solder joints was analyzed by Scanning Electron Microscopy. Based on the results, it can be said that the shear strength of joints formed by Vapor Phase soldering is slightly lower than the strength of joints formed by IR reflow. The thermal profile of Vapor Phase soldering needs further optimization. The detailed results are presented in the paper.

关键词： Soldering Joints Intermetallic Heat transfer Resistors Temperature measurement

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Evaluating vapor phase soldering for fine pitch BGA

Evaluating vapor phase soldering for fine pitch BGA

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International Spring Seminar on Electronics technology

作者： Attila Geczy Reka Batorfi Laszlo Gal Zsolt Illyefalvi-Vitez Peter Szoke Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Surface mounted components are considered fine pitch if lead pitches are equal or lower than 0.65 mm (25 mils). Fine pitch Ball Grid Array (BGA) Integrated Circuits (IC-s) require special considerations for design, assembly and failure analysis. Design for Manufacturing (DfM) is a key aspect in the PCB design process. As for soldering, Vapor Phase Soldering (VPS) is an emerging reflow method for fine pitch surface mounted components. Thermal profiling investigation is also important during the process of VPS. The Department of Electronics technology of BME has been carrying out research and prototyping with the use of an Asscon Quicky 450 type Vapor Phase Soldering system and a locally developed experimental VPS system. The application of two systems makes it possible to use parallel experiments with two different Galden liquids with distinct boiling points. The experimental VPS system is very flexible considering heat profiling and temperature control. In this paper an experiment is presented, where a custom set of test boards and 0.65 mm pitch BGA were used and a set of thermal profiles were measured to evaluate VPS reflow soldering for fine pitch surface mounted components.

关键词： Heating Temperature measurement Soldering Surface treatment Springs

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Adaptive PDF speed control for motion control

Adaptive PDF speed control for motion control

引用

International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Laszlo Szamel Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper proposes two model reference adaptive PDF speed control methods. Following from the structure of model reference parameter adaptive control it makes it easier to reach overshootless. The approaching block d... 详细信息

关键词： Adaptation model Mathematical model Velocity control Adaptive control Load modeling Torque Lyapunov method

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Condition assessment of mixed oil-paper and XLPE insulated cable lines by voltage response method

Condition assessment of mixed oil-paper and XLPE insulated c...

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International Symposium on Electrical Insulation

作者： Zoltán Ádám Tamus István Berta Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The voltage response method is an effective tool to diagnose the condition of the oil-paper insulation. The initial slopes of decay and return voltages are in direct correlation with dielectric processes. Testing of oil-paper insulation with this method the two main deteriorating processes thermal aging and moistening can be investigated separately. The thermal aging of PVC insulation can also be followed by this method. By the newest result of the authors, this method seems a promising tool to solve the diagnostic problem of joint polymeric and oil-paper insulated cable lines. By the newly developed correction method, the aging state of joint (oil-paper and extruded) cable lines can be determined at certain circumstances. Practically, after only one measurement on a mixed cable line the feasible values of voltage response of the both parts can be estimated by the knowledge of the parameters of the sections.

关键词： Cable insulation Oil insulation Aging Dielectrics and electrical insulation Voltage measurement Strontium Oil filled cables Polarization Moisture Dielectric measurements

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