Asymmetic Key Recovery On A Restored Database

Hi
I have an sql server 2005+sp2 instance and a db on it.
I have create a database master key (specifying a password so it WILL NOT get encrypted by the server master key) on my database and backed it up

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'test'
go
BACKUP MASTER KEY TO FILE = 'c:Genesis_DBMasterKey.key' ENCRYPTION BY PASSWORD = 'test'


Then I have created a asymmetic key without specifying a password therefore the key will get encrypted bt the database master key.

CREATE ASYMMETRIC KEY card WITH ALGORITHM = RSA_512


And then for test I run

DECLARE @Encryptvalasym varbinary(MAX)
SET @Encryptvalasym = EncryptByAsymKey(AsymKey_ID('card'), 'EncryptedData')
SELECT @Encryptvalasym
SELECT CONVERT(varchar(max),DecryptByAsymKey(AsymKey_ID('card'),@Encryptvalasym) )


And the result is OK.

Problem: as a recovey plan if I restore the database on the same or other instance (althogh the asymmetic key is part of backup) the decrypt doesn€™t work.
I have tried to create a bank database restore tha databse master key and recreate the asymmetric key, but I€™m afraid I€™m still not having any luck with it, as it does not decrypt.

My main issue is that is any case if I have to recover the database , how do I have to make sure that encryption/Dycription will work?
Thanks