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DROP ASYMMETRIC KEY (Transact-SQL)
SQL Server 2005
Removes an asymmetric key from the database.
Transact-SQL Syntax Conventions
An asymmetric key with which a symmetric key in the database has been encrypted, or to which a user or login is mapped, cannot be dropped. Before you drop such a key, you must drop any user or login that is mapped to the key. You must also drop or change any symmetric key encrypted with the asymmetric key. You can use the DROP ENCRYPTION option of ALTER SYMMETRIC KEY to remove encryption by an asymmetric key.
Metadata of asymmetric keys can be accessed by using the sys.asymmetric_keys catalog view. The keys themselves cannot be directly viewed from inside the database.
Reference
CREATE ASYMMETRIC KEY (Transact-SQL)ALTER ASYMMETRIC KEY (Transact-SQL)
ALTER SYMMETRIC KEY (Transact-SQL)
