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Future Network and Mobile Summit

作者： Marc Barisch Elena Torroglosa Garcia Mario Lischka Rodolphe Marques Ronald Marx Alfredo Matos Alejandro Perez Mendez Dirk Scheuermann Institute of Communication Networks and Computer Engineering University of Stuttgart Stuttgart Germany University of Murcia Murcia Spain NEC Laboratories Europe NEC Europe Limited Heidelberg Germany Instituto de Telecomunicações de Aveiro Universidade de Aveiro Aveiro Portugal Fraunhofer Institute of Secure Information Technology Darmstadt Germany

In recent years, Identity Management (IdM) has gained a lot of attention in industry, standardisation and academia. In particular, a couple of research projects, like Daidalos or Prime, have invested considerable effort to bring IdM forward, to take advantage of features like improved usability and security. Nevertheless, there are important issues that have not been addressed so far. The SWIFT project leverages IdM as a key technology of the Future Internet, tackling problems like the integration of the network and application layer from an IdM perspective as well as the use of electronic identity cards. Moreover, aspects like the integration of several user devices, backward compatibility and a new access control infrastructure are required by future IdM solutions. We consider all these aspects by extending existing IdM solutions with six new security and privacy enablers that are part of the overall SWIFT framework. These enablers have been partially implemented towards a new IdM architecture. First evaluation results of the implementation are promising to pave the way towards future IdM solutions.

关键词： Privacy Authentication Usability Cryptography Access control communications technology

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A loose-strategy-based Complexity Scalable Motion Estimation method for video coding

A loose-strategy-based Complexity Scalable Motion Estimation...

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Congress on Image and Signal Processing, CISP

作者： Weiyao Lin Krit Panusopone David M. Baylon Ming-Ting Sun Hongxiang Li Institute of Image Communication and Information Processing Shanghai Jiaotong University Shanghai China Advanced Technology Department CTO Office Home & Networks Mobility Motorola Inc. San Diego CA USA Department of Electrical Engineering University of Washington Seattle WA USA Department of Electrical and Computer Engineering North Dakota State University Fargo ND USA

In this paper, a new Complexity Scalable Motion Estimation (CSME) method is proposed which can perform Motion Estimation adaptively under different computation or power budgets while keeping high coding performance. We first propose to use a new class-based method to measure the Macroblock (MB) importance. Based on the new MB importance measure, a complete CSME framework is then proposed. The proposed method allocates computation in a one-pass flow and is based on a loose strategy where frames can borrow computation from other frames to achieve better performance under the same computation budget. Experimental results demonstrate that the proposed method can allocate computation more accurately than previous methods.

关键词： Encoding Resource management computer integrated manufacturing Motion estimation Video coding Algorithm design and analysis Classification algorithms

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Numerical analysis of four-wave-mixing based multichannel wavelength conversion techniques in fibers

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Journal of Semiconductors 2009年第5期30卷 55-59页

作者：贾亮张帆李明刘育梁陈章渊 Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer SciencePeking University

We numerically investigate four-wave-mixing （FWM） based multichannel wavelength conversion for amplitude-modulated signals, phase-modulated signals, together with mixed amplitude and phase modulated signals. This paper also discusses the influence of stimulated Brillouin scattering （SBS） effects on high-efficiency FWM-based wavelength conversion applications. Our simulation results show that DPSK signals are more suitable for FWM-based multichannel wavelength conversion because the OOK signals will suffer from the inevitable data- pattern-dependent pump depletion. In future applications, when the modulation format is partially upgraded from OOK to DPSK, the influence of OOK signals on the updated DPSK signals must be considered when using multi-channel wavelength conversion. This influence becomes severe with the increase of OOK channel number. It can be concluded that DPSK signals are more appropriate for both transmission and multichannel wavelength conversion, especially in long haul and high bit-rate system.

关键词： stimulated Brillouin scattering wavelength conversion four-wave mixing nonlinear optics

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A method to evaluate uncertain and conicting trust and authenticity statements

A method to evaluate uncertain and conicting trust and authe...

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1st International Workshop on Managing Insider Security Threats, MIST 2009 - In Conjunction with IFIPTM 2009

作者： Gutscher, Andreas Institute of Communication Networks and Computer Engineering Universität Stuttgart 70569 Stuttgart Germany

Countless Internet applications and platforms make it easy to communicate, to collaborate and to exchange information and opinions with a huge number of individuals. However, it is getting more and more difficult to distinguish honest and reliable individuals from malicious users distributing false information or malware. Digital signatures, webs of trust and reputation systems can help to securely identify communication partners and to estimate the trustworthiness of others, but there is a lack of trust and authenticity evaluation methods that do not show counterintuitive effects in the case of conicting opinions. This article proposes a new integrated method to evaluate uncertain and conicting trust and authenticity statements. It introduces a set of operators and inference rules for combining and reasoning with these statements, it defines an approach to compute the resulting confidence values of derived statements and it compares different computation algorithms. The computation is based on a probability theoretical model in order to exclude inconsistencies and counter-intuitive effects.

关键词： Malware

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Numerical analysis for four-wave mixing based wavelength conversion of differential phase-shift keying signals

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Chinese Optics Letters 2009年第7期7卷 617-620页

作者：贾亮张帆李明刘育梁陈章渊 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences

We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying （DPSK） signals based on four-wave mixing （FWM） in highly nonlinear fiber （HNLF）. Using multi-tone pump phase modulation techniques, high efficiency wavelength conversion of DPSK signals is achieved with the stimulated BriIlouin scattering （SBS） effects effectively suppressed. Our analysis shows that there is a compromise between conversion efficiency and converted idler degradation. By optimizing the pump phase modulation configuration, the converted DPSK idler＇s degradation can be dramatically decreased through balancing SBS suppression and pump phase modulation degradation. Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems.

关键词： Conversion efficiency Degradation Frequency modulation Optical frequency conversion Phase shift Phase shift keying Pumps Stimulated Brillouin scattering

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Nanotaper mode converter based on silicon pillar waveguide

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Chinese Optics Letters 2009年第4期7卷 312-314页

作者：易华祥祝阳周治平 Wuhan National Laboratory for Optoelectronics College of Science and EngineeringHuazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

A two-dimensional （2D） optimized nanotaper mode converter is presented and analyzed using the finite- difference time-domain （FDTD） method. It can convert the mode size in a silicon pillar waveguide （PWG） from 4 μm to 1 μm over a length of 7 μm and achieve a transmission efficiency of 83.6% at a wavelength of 1.55 μm. The dual directional mode conversion of the nanotaper and its ability to perform mode compression and expansion are also demonstrated. The broadband with high transmittance is satisfied in this structure. Using this silicon-based nanotaper, mode conversion between integrated photonic devices can be more compact and efficient.

关键词： Finite difference time domain method Method of moments Plants (botany) Waveguides

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Silicon electro-optic modulator with high-permittivity gate dielectric layer

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Chinese Optics Letters 2009年第10期7卷 924-925页

作者：朱梦霞周治平郜定山 Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

A high-permittivity （high-k） material is applied as the gate dielectric layer in a silicon metal-oxide- semiconductor （MOS） capacitor to form a special electro-optic （EO） modulator. Both induced charge density and modulation efficiency in the proposed modulator are improved due to the special structure design and the application of the high-k material. The device has an ultra-compact dimension of 691 μm in length.

关键词： Electrooptical devices Gate dielectrics Gates (transistor) Modulation Permittivity Semiconducting silicon compounds

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Sensitivity and detection limit of dual-waveguide coupled microring resonator biosensors

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Chinese Optics Letters 2009年第7期7卷 598-600页

作者：夏志轩易华祥陈曜周治平 Wuhan National Laboratory for Optoelectronics School of Optoelectronics Science and Engineering Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

We show that a linear relation exists between the device sensitivity and the quality （Q） factor of a dual- waveguide coupled microring resonator optical biosensor when the optimal conditions are satisfied. We also show that the detection limit depends on the loss coefficient and signal-to-nosie ratio （SNR） of the overall system, rather than the circumference of the ring. For a microring resonator sensor whose Q factor is 20000, the detection limit is found to be about 10-7 with 30-dB SNR, which is in good agreement with reported experimental data. These results indicate that loss reduction is the top priority in the design and fabrication of highly sensitive microring resonator optical biosensors.

关键词： Acoustic intensity Optical resonators Signal to noise ratio Signal transduction Waveguides

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Designing high-speed packet processing tasks at arbitrary levels of abstraction - Implementation and evaluation of a MIXMAP system

Designing high-speed packet processing tasks at arbitrary le...

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2009 Symposium on Architecture for Networking and communications Systems, ANCS'09

作者： Hauger, Simon Institute of Communication Networks and Computer Engineering Universität Stuttgart Pfaffenwaldring 47 70569 Stuttgart Germany

ISBN: (纸本)9781605586304

Packet processing systems of forthcoming high-speed network nodes demand extremely high processing rates, but also modularity and easy adaptability due to new or evolving protocols and services. As the fixed architecture and instruction set of current network processors sometimes hinders an efficient implementation of processing tasks, we introduced the MIXMAP architecture [4] that is designed to offer programmability at multiple levels of abstraction. Now we describe the prototypical realization of this architecture showing its feasibility. Our results indicate that up to 170 million packets per second can be processed with this architecture using current FPGAs. By implementing packet processing tasks at register-transfer level and at software level, we validate the architecture's applicability and the benefits of implementing at an appropriate level of abstraction. © 2010 ACM.

关键词： Abstracting

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Modelling the impact of virtual identities on communication infrastructures

Modelling the impact of virtual identities on communication ...

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5th ACM Workshop on Digital Identity Management, DIM '09, Co-located with the 16th ACM computer and communications Security Conference, CCS'09

作者： Barisch, Marc Institute of Communication Networks and Computer Engineering Universität Stuttgart Pfaffenwaldring 47 70569 Stuttgart Germany

ISBN: (纸本)9781605587868

The virtual identity concept has been introduced to protect the user's privacy towards service providers as well as towards access network providers on a service session basis. So far the concept has been only considered from the security and privacy perspective. However, performance analysis is necessary as well to gain insights into the additional costs and their scaling behavior with respect to signaling load and state management. In this paper we propose an analytical model to evaluate the cost introduced by virtual identities. The model allows to quantify the additional signaling overhead and the additional states created by distributing service sessions of users across several virtual identities. We exemplify the use of the model for an authentication, authorization and accounting (AAA) infrastructure based on EAP-TLS and derive figures on the required signaling bandwidth and state overhead to support the virtual identity concept in various service usage scenarios. Copyright 2009 ACM.

关键词： Authentication

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