Security settings

Hi,
I'm able to create multiple project and assign each one to each user by setting author on username and setting "access own project issues" and "create project issues" in user's permissions.
But what about assign a project to at least 2 users?
Is there a way to do:

Project1
User1 can access and create project issues
User2 can access and create project issues
User3 can't access it at all (no view, etc..)

Project2
User1 can't access it at all (no view, etc..)
User2 can access and create project issues
User3 can't access it at all (no view, etc..)

Project3
User1 can't access it at all (no view, etc..)
User2 can't access it at all (no view, etc..)
User3 can access and create project issues

?

Thank you