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Wireless Application Protocol (WAP) is one of the technical standards for information over a mobile wireless network. Mobile devices such as mobile phones that use the protocol have a WAP browser as a web browser. WTLS (wireless transport layer security) inherited from TLS (Transport Layer Security). WTLS uses similar semantics adapted for a low bandwidth mobile device. As compared to TLS main ...

Consider a communication link where the last hop is wireless and TCP is used as transport protocol over the end-to-end connection. We study the capability of the link layer to hide losses over the wireless link to TCP in spite of the time varying transmission quality. We focus on linklayer retransmission mechanisms and determine their parameter setting in such a way that a reliable communicatio...

One fundamental issue in high-speed wireless local area networks (LANs) is to develop efficient medium access control (MAC) protocols. In this paper, we focus on the performance improvement in both MAC layer and transport layer by using a novel medium access control protocol for high-speed wireless LANs deploying carrier sense multiple access/collision avoidance (CSMA/CA). We first present a re...

Proving an identity over a public link is complex when there is communication between Client and Server. Secure Shell protocol is deployed, to determine a client's identity through Password-based key exchange schemes, over a public network, by sharing a (short) password only, with a session key. Most of the existing schemes are vulnerable to various dictionary attacks. SSL is the de facto stand...

This document specifies the use of the KeyNote trust-management system as an authorization extension in the Transport Layer Security (TLS) Handshake Protocol, according to guidelines in RFC 5878. Extensions carried in the client and server hello messages confirm that both parties support the desired authorization data types. Then, if supported by both the client and the server, KeyNote credenti...

One of the most difficult processes which limit our ability to generate realistic, high-resolution simulations of the ocean state is intermittent nature of oceanic turbulence related to the presence of coherent structures at wide range of scales when simple parameterizations based on eddy diffusion concepts do not necessarily provide the correct answer. The coherent vortices have life-times in ...

The accelerated development of Internet and mobile devices has lead to new QoS-demanding distributed applications and new QoS-providing communication services, particularly at the transport level. The diversity of transport services and underlying networks environments asks for a novel design of the transport layer, able to provide in a transparent and autonomous way the most adapted service to...

We present the theory of the multi-α-solutions of the variational problem for the upper bounds on the convective heat transport in a heated from below horizontal fluid layer with rigid lower boundary and stress-free upper boundary. A sequence of upper bounds on the convective heat transport is obtained. The highest bound Nu = 1+(1/6)R is between the bounds Nu = 1+0.152R for the case of a fluid ...

Gaining a detailed understanding of water transport behavior through ultra-thin polymer membranes is increasingly becoming necessary due to the recent interest in exploring applications such as water desalination using nanoporous membranes. Current techniques only measure bulk water transport rates and do not offer direct visualization of water transport which can provide insights into the micr...