Encrypting A Column

I am trying to encrypt a column, and then do a select and decrypt the results.
I believe that I am encrypting the data properly, but whenever I try and do a select the column comes back as NULL.
If I do a select without trying to decrypt the column (select * from table) I get the following:

Name | Dept | Encrypted_Info
-----------------------------------------------
scott | it | 0x38383131


If I try and decrypt it I get this


Name | Dept | Encrypted_Info
-----------------------------------------------
scott | it | NULL

This is the query that I put together to create the database, table, DB Master Key, Cert, encrypt the column, and then select and decrypt the result:


create database QA_Encrypted

Go

create table QA_Encrypted.dbo.Enc_Table1

(UserName varchar(50),

Dept varchar(50),

Encrypted_Info varbinary(MAX))

Go
use QA_Encrypted

Go

if not exists (select * from sys.symmetric_keys where symmetric_key_id = 101)

create Master Key encryption by password = 'Pa55w0rd'

Go

Create Certificate QACert

with subject = 'Certificate for Testing'

Go

Create symmetric Key QAEncryptionKey with Algorithm = DES

Encryption by certificate QACert

Go

open symmetric key QAEncryptionKey decryption by certificate QACert

update QA_Encrypted.dbo.Enc_Table1 set Encrypted_Info = EncryptByKey(Key_GUID('QAEncryptionKey'), 'AUTHENTICATOR')

Go

use QA_Encrypted

insert into dbo.enc_table1 values ('scott', 'it', Convert(varbinary,'8811'))


OPEN Symmetric Key QAEncryptionKey

Decryption by CERTIFICATE QACert

select * from dbo.Enc_Table1

Select Username, Dept, Convert(varchar, DecryptByKey(Encrypted_Info)) as "decrypted"

from dbo.Enc_Table1


Any help would be greatly appreciated.
Thanks in advance