How I can assign permissions for components so that different users can have access to specified components?

[Sebastian]

In Jira I have project with several components and I would like to grant access for different users to view only those components for which they have access to is it possible?

[Nic Brough -Adaptavist-]

You can't do this directly.  JIRA permissions are done at a project level.

The closest you can get is to find/write a listener that detects create and edit events on an an issue and sets the security level on the issues (see https://confluence.atlassian.com/display/JIRA/Configuring+Issue-level+Security )