How to save Password Encrypt form and show password Decrypt form in Sql Server 2008

How to save Password  Encrypt form and show password  Decrypt form in Sql Server 2008

--first  create table logindetails in database test.....

 use test

 create table logindetails (EmailId nvarchar(50) primary key,Password nvarchar(50))

 --Insert Encrypted Password in Sql Server:-

  insert into logindetails (EmailId,Password) values   ('kush@cetpainfotech.com',encryptbypassphrase('passkey','kush1234'))

  -- fetch  data from table without Decrypted form

  select * from  logindetails

 -- Show data with Decrypted form

  select EmailId,CONVERT(varchar(max),Decryptbypassphrase('passkey',Password)) as Password    from logindetails