By Reinhard Posch
This quantity covers many facets of multimedia and communications safeguard, from nationwide safeguard regulations to dossier server architectures, from hypertext records to really good cryptographic algorithms. It offers the reader with a spectrum of up to date wisdom at the issues coated.
Read or Download Communications and Multimedia Security: Proceedings of the IFIP TC6, TC11 and Austrian Computer Society joint working conference on communications and multimedia security, 1995 PDF
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Extra info for Communications and Multimedia Security: Proceedings of the IFIP TC6, TC11 and Austrian Computer Society joint working conference on communications and multimedia security, 1995
5 Keywords: Multimedia Information Systems, Security and Protection, Online Information Systems 1 INTRODUCTION The hypertext paradigm currently forms the basis of many computerised information systems. Hypertext is 'an assemblage of texts, images, and sounds-nodes-connected by electronic links so as to form a system whose existence is contingent upon the computer' (Slatin, 1991:56). Some authors prefer to emphasise that distributed computers have to be used and that the use of links between nodes are not the defining aspect of hypertext (Maurer, 1993): Thus, we suggest that the term 'hypermedia system' is reserved for large, networked multimedia systems that support annotation, customization, and cooperation.
The proposed open distributed document system adopts a thoroughly optimistic approach for document processing. Documents in the system are freely replicated, migrated or cached, and users are free to operate upon document versions. By using such an optimistic approach, users enjoy very high availability of documents, but they have no guarantee that their update transactions will not conflict with other transactions issued by others concurrently, which leads to waste of resources. An optimistic approach is a better choice mainly because of rare conflict transactions.
E. two or more transactions that appear to conflict but actually their operations are compatible. However, such a locking mechanism must be very complicated and difficult to manage. But for the system efficiency, some kind of "soft", simple and untrusted locking mechanisms could be devised to give warning to relevant validation servers and users of possible transaction conflict. g. off-line contact. \Ve would expect by using an untrusted locking mechanism some conflict transactions could be warned and thus avoided at their early stage, while the trust relationship in the system and the optimistic approach for concurrency control could still remain unchanged.