Alteration Method of Schedule Information on Public Cloud for Preserving privacy

摘要

We are currently experiencing an explosion of cloud technologies. However, a cloud service administrator may be an untrustworthy third party. Therefore, companies dealing with confidential information cannot use a public cloud. In this paper, we propose a method for preventing the leakage of private information on a cloud schedule service. In this method, even a cloud administrator or a hacker who steals a cloud service login key cannot read the true.schedule because the schedule date is altered. and schedule content is encrypted. Consequently we can safely use a public cloud schedule service with this method. We also evaluated the method's performance using an actual alteration program on Google server. We implement the proposed method and show the performance is practical by evaluating actually.