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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Trustworthy terminals

Trustworthy terminals Trustworthy only to user to others as well Ability to communicate Security in distributed systems Availability by redundancy and diversity Cryptography Confidentiality by encryption Integrity by message authentication codes (MACs) or digital signatures 125

Availability Infrastructure with the least possible complexity of design Connection to completely diverse networks • different frequency bands in radio networks • redundant wiring and diverse routing in fixed networks Avoid bottlenecks of diversity • e.g. radio network needs same local exchange as fixed network, • for all subscriber links, there is only one transmission point to the long distance network 126

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