2,198 research outputs found
Cryptographic Energy Costs are Assumable in Ad Hoc Networks
Performance of symmetric and asymmetric
cryptography algorithms in small devices is presented. Both temporal
and energy costs are measured and compared with the basic
functional costs of a device. We demonstrate that cryptographic
power costs are not a limiting factor of the autonomy of a device
and explain how processing delays can be conveniently managed
to minimize their impact
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A twoâstep authentication framework for Mobile ad hoc networks
The lack of fixed infrastructure in ad hoc networks causes nodes to rely more heavily on peer nodes for communication. Nevertheless, establishing trust in such a distributed environment is very difficult, since it is not straightforward for a node to determine if its peer nodes can be trusted. An additional concern in such an environment is with whether a peer node is merely relaying a message or if it is the originator of the message. In this paper, we propose an authentication approach for protecting nodes in mobile ad hoc networks. The security requirements for protecting data link and network layers are identified and the design criteria for creating secure ad hoc networks using several authentication protocols are analyzed. Protocols based on zero knowledge and challenge response techniques are presented and their performance is evaluated through analysis and simulation
Encryptionâs Importance to Economic and Infrastructure Security
Det övergripande syftet med den hĂ€r avhandlingen var att utreda om network coopetition, samarbete mellan konkurrerande aktörer, kan öka vĂ€rdeskapandet inom hĂ€lso- och sjukvĂ„rden. Inom hĂ€lso- och sjukvĂ„rden Ă€r network coopetition ett Ă€mne som fĂ„tt liten uppmĂ€rksamhet i tidigare studier. För att besvara syftet utvecklades en modell för network coopetition inom hĂ€lso- och sjukvĂ„rden. Modellen applicerades sedan pĂ„ en del av vĂ„rdkedjan för patienter i behov av neurokirurgisk vĂ„rd. Resultaten frĂ„n avhandlingen visar att: (1) FörutsĂ€ttningarna för network coopetition i vĂ„rdkedjan för patienter i behov av neurokirurgisk vĂ„rd Ă€r uppfyllda. (2) Det finns exempel pĂ„ horisontell network coopetition i den studerade vĂ„rdkedjan. (3) Det existerar en diskrepans mellan hur aktörerna ser pĂ„Â sitt eget och de andra aktörernas vĂ€rdeskapande. (4) VĂ€rdeskapandet bör utvĂ€rderas som ett gemensamt system dĂ€r hĂ€nsyn tas till alla aktörer och utvĂ€rderas pĂ„ process- nivĂ„ dĂ€r hĂ€nsyn tas till alla intressenter. Dessa resultat leder fram till den övergripande slutsatsen Ă€r att network coopetition bör kunna öka vĂ€rdeskapandet för högspecialiserade vĂ„rdkedjor med en stor andel inomlĂ€nspatienter.The overall purpose of this thesis was to investigate whether network coopetition, cooperation between competitive actors, can increase the value creation within the health care system. Within health care, network coopetition is a subject granted little attention in previous research. To fulfil the purpose a model for network coopetition within the health care system was developed. The model was the applied to one part of the chain of care for patients in need of neurosurgery. The results from this thesis show: (1) The conditions for network coopetition in the chain of care for patients in need of neurosurgery are fulfilled. (2) Examples of horizontal network coopetition have been found in the studied chain of care. (3) There is an existing discrepancy between how each actor recognizes its own and the other actorsâ value creation. (4) The value creation ought to be evaluated as a common system where all actors are taken into account and at a process level where all stakeholders are considered. These results supports the final conclusion that network coopetition ought to be able to increase the value creation for highly specialized chain of cares with a large share of within-county patients
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