Actually, there is. Atlassian use it in their support project.
You have to explicitly enable it (and train your admins not to use it incorrectly - the main reason it's not enabled by default is it can throw Jira into a spectacular wibble if you get it wrong!) and plan how to use it - locking down the rest of your permissions.
See http://confluence.atlassian.com/display/JIRA/Current+Reporter+Browse+Project+Permission
Not by user, but it's done by project. Look at issue security schemes.
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I'm in the Edit Permissions area of my permission scheme and I see a Project Permissions but it only allows me to open browsing permissions but not restrict them :(
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It's not in the permission scheme, it's under issue security schemes. Check the docs, I even posted the link.
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