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The Session Initiation Protocol (SIP) is an important multimedia session establishment protocol used on the Internet. Due to the nature and deployment realities of the protocol (ASCII message representation, widespread usage over UDP, limited use of encryption), it becomes relatively easy to attack the protocol at the message level to launch denial of service attacks. To mitigate this, self- learning...
Reducing the time the radio is on in wireless devices results in lower power consumption, so sending the same data in fewer bytes can greatly extend the lifetime of a network. In this paper, we explore the use of protocol-agnostic packet compression, a technique orthogonal to current explicit compaction techniques. Because it functions as a transparent layer inside a communication stack and makes...
Both research and practice have revealed that sensor devices running the 802.15.4 on their MAC layer may be competing for wireless communication on the 2.4 GHz ISM band with Wi-Fi, Bluetooth and other proprietary devices. Building upon a SunSPOT development platform, we evaluate the impact of channel hopping on interference mitigation in the 2.4 GHz ISM band and propose a channel hopping model that...
This paper addresses policymakers at national and international levels - regulators, standards bodies, politicians - arguing that there is no “beyond” the Internet. With the Internet so intimately intertwined with the lives of people, being used to build the backbone of large, important communities, an attempt to replace it with a new network would generate immense friction, and cost a lot. The transition...
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