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This paper deals with the security problems facing with next generation computing environments. As the method, Virtualized Security Defense System (VSDS) is proposed under the application of ‘Trello’ (web application) for online patient networks, it deals with the following problems; (1) blurred security boundaries between attackers and protectors, (2) group key management system, (3) secret-collaborative works and sensitive information-sharing for group members, (4) preserving privacy, (5) rendering of 3D image (member indicator, high level of security). Consequently, although current IT paradigm is changing to more ‘complicated’, ‘overlapped’ and ‘virtualized’, VSDS makes it securely possible to share information through collaborative works.
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