giving 'limited' CONTROL permission to a login (SQL2012)

a login needs permission to

but it was denied but after researching gave the below permissions
CONTROL (grant CONTROL  to user). now it is able to do the above two open.

but now it has CONTROL on whole database. is it possible to isolate or minimize its control to just the two elements (OPENs) and not the whole db?
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Ryan McCauleyEnterprise Analytics ManagerCommented:
To open to symmetric key (or a certificate), you only need CONTROL permissions on that object. Opening the master key requires CONTROL permission on the database, though, and it doesn't appear that you can grant permissions to open this key without granting these database-level rights (there's nothing that provides this access while being more granular).

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Microsoft SQL Server 2008

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