How can I restrict user to see only information related to specific project, and not to see any other projects
One way is to make the jira-users groups an 'access' group only and not used for authorization in project security. Then create specific per-project access groups. This approach is secure but is more of an administration burden to manage.
http://confluence.atlassian.com/display/JIRASTUDIO/Managing+Users+and+Groups#ManagingUsersandGroups-Restrictingprojectvisibility
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