First generation wireless systems, which primarily provide analog voice service, are widely in use worldwide. Second generation systems support digital voice/data traffic; some of these systems are already deployed or undergoing deployment. Third generation wireless networks will ultimately carry multimedia traffic that are characterized by combination of different informaion streams of diverse nature (e.g., voice, video, image, data). Some of the salient features of multimedia applications are high speed and changing bit rates (periodic and bursty arrivals), several virtual connections over the same access, synchronization of different information streams, and various service/deliveIy requirements (QoS).
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This paper presents the design and implementation of DOT, a flexible architecture for data transfer. This architecture separates content negotiation from the data transfer itself. Applications determine what data they need to send and then use a new transfer service to send it. This transfer service acts as a common interface between applications and the lower-level network layers, facilitating innovation both above and below. The transfer service frees developers from re-inventing transfer mechanisms in each new application. New transfer mechanisms, in turn, can be easily deployed without modifying existing applications.
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Whether we like it or not the technology and culture of Web 2.0 is something all businesses should take note of – but as usual businesses are left trying to work out how it all affects them. To offer some guidance through simple explanation of the technology and 5 Ideas where real issues can be addressed, this white paper goes some way towards clearing the way for businesses to work with Web 2.0.
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Typical content distribution solutions are based on placing dedicated equipment inside or at the edge of the Internet. The best example of such solutions is Akamai [1], which runs several tens of thousands of servers all over the world. In recent years, a new paradigm for Content Distribution has emerged based on a fully distributed architecture where commodity PCs are used to form a cooperative network and share their resources (storage, CPU, bandwidth).
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Basics Bluetooth Security Attacks via Bluetooth - Introduction BlueSnarf BlueSnarf++ BlueBug BlueJacking HeloMoto BlueSmack Cracking the Bluetooth PIN Conclusion Bluetooth Basics Originally invented 1994 by Ericsson Technology for connections of short range devices Bluetooth operates within license-free ISM band (2.4 – 2.48 GHz) To prevent interferences: frequency hopping base band frequency switched 1600 times / s ISM band devided into 79 freq. levels, 1 MHz distance Connect two devices: pairing Piconet
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The security mechanisms Known vulnerabilities Tools that are used Live demonstration Who is investigating Adam Laurie CSO of The Bunker Secure Hosting Ltd. DEFCON staff and organizer Maintainer of the Linux Bluetooth stack Marcel Holtmann Martin Herfurt
Security researcher Founder of trifinite.org What is this about What is Bluetooth Bluetooth SIG Trade association Founded 1998 Owns and licenses IP Bluetooth technology A general cable replacement Using the ISM band at 2.4 GHz Protocol stack and application profiles How it works Data and voice transmission ACL data connections SCO and eSCO voice channels Piconet and scatternet topology Frequency hopping 79 channels 1600 hops per second Creating the topology Hopping sequence defines the piconet
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Supporting VoIP Solutions with Traffic-Engineered MPLS. … VoIP solution,
organizations must consider the following issues:
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