Interactive Distributed Multimedia Systems and by Professor D. Shepherd (auth.), Thomas Plagemann, Vera Goebel

By Professor D. Shepherd (auth.), Thomas Plagemann, Vera Goebel (eds.)

This publication constitutes the refereed court cases of the fifth foreign Workshop on Interactive dispensed Multimedia structures and Telecommunication providers, IDMS'98, held in Oslo, Norway, in September 1998.
The 23 revised complete papers awarded have been rigorously chosen from a complete of sixty eight submissions. additionally incorporated are seven place statements. The ebook is split into topical sections on allotted multimedia purposes; structures for collaborative platforms; MPEG; coding for WWW, instant, and cellular environments; QoS and consumer features; movement keep watch over, congestion keep watch over, and multimedia streams; multimedia servers, records, and authoring; and garage servers.

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The CAST-128 RFC2144 implementation uses 128 bit keys. g. no complementation property and an absence of weak and semi-weak keys. x. x and GPG Koch98. GPG is a free P GP replacement which does not rely on patented algorithms. For users with low computing power, speed issues are most important. Blowfish Schn94 is one of the fastest secure block ciphers which encrypts plaintext on 32-bit microprocessors at a rate of 26 block cycles per byte while being very compact. It was designed by Bruce Schneier with a variable key length up to 448 bit.

SCUA is an emailbased approach which allows to initiate conferences securely using PEM (Privacy Enhanced Mail). For the actual transmission of data, SCUA relies on the builtin weak security mechanisms of the MBone tools. After key exchange, the tools have to be started with the session key as a parameter or the key has to be introduced by hand. The following two projects focus on the specific needs of teleteaching but do not consider security issues: The "Authoring on the Fly" (AOF) concept BaOt96 merges broadcasting of a lectures with authoring of CBT software.

Inside the component of the Context Creator, the retrieved information is converted to the capabilities of the mobile device. This information processing includes dynamic media conversion and type conversion as well as dynamic page generation. g. software upgrade by download). Inside the open and object oriented system design, all these components are realized as interchangeable modules, which can be combined according to the specific requirements of the mobile device, the customer and the service provider.

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