How can I restrict a client's access to a project?

[Shubham Dhama]

I am new to JIRA so I apologize if this is a noob query.

I need to restrict a client's access to a project to only the issues that are either created by the client or assigned to the client?

If I put the current assignee to Browse Project permission than the project name becomes visible to all the users which is not acceptable.

What I need is: Client only sees an issue if he/she has created it or has been assigned to him/her by the project admin.

[Joe Pitt]

You want to use an issues security scheme  

https://confluence.atlassian.com/adminjiraserver073/configuring-issue-level-security-861253265.html