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05/13/2009 at 11:59AM PDT, ID: 24406117
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8.6

sql server 2005 certificates for encrypting and decrypting data

Asked by grg-it in SQL Server 2005

Tags: Sql Server 2005

Question I have relates to encryption and decryption of data using Certificates in Sql Server 2005 and how do I recover encrypted data back if I drop this certificate accidentally? Or is this even possible? First I drop already existing certificate and then I tried recreating new certificate where it generates new certificate id and later tried to decrypt encrypted data with new certificate but with no success. Is this even possible? If not then should we rely on certificates that can so easily be dropped. What is the best approach? How can I retrieve encrypted data that was once encrypted using old certificate key.

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Example:
 
--Create certificate
CREATE CERTIFICATE WebSitePWDCert
ENCRYPTION BY PASSWORD ='s#29&^*@!q'
WITH SUBJECT = 'This cert encrypts credit card'
GO
 
--Create table if not exist
IF  NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[ini_file]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[ini_file](
	[id] [int] IDENTITY(1,1) NOT NULL,
	[ini_name] [varchar](20) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
	[ini_binary] [varbinary](8000) NULL,
 CONSTRAINT [PK_ini_file] PRIMARY KEY CLUSTERED 
(
	[id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
 
GO
END
GO
 
--Insert Encrypted card number to ini_file table
INSERT INTO ini_file (ini_name,ini_binary)
VALUES ('Access',EncryptByCert(cert_id('WebSitePWDCert'),'473429382900'))
GO
 
--Decrypts and shows credit card number. Works Fine.
select	convert(varchar(max), 
	DecryptByCert(cert_id('WebSitePWDCert'),ini_binary,N's#29&^*@!q'))
  from	ini_file
 where	ini_name ='ACCESS'
GO
 
--Here I drop certificate and then rerun select query
 
drop certificate WebSitePWDCert
 
-- Select query now returns null. At this point did I loose all my encrypted data?
 select convert(varchar(max), 
            DecryptByCert(cert_id('WebSitePWDCert'),ini_binary,N's#29&^*@!q'))
   from ini_file
where ini_name ='ACCESS'
 
--Now I Create New Certificate
CREATE CERTIFICATE WebSitePWDCert
ENCRYPTION BY PASSWORD ='s#29&^*@!q'
WITH SUBJECT = 'This cert encrypts credit card'
GO
 
--Execute same select query. But won't work now.
  select convert(varchar(max), 
             DecryptByCert(cert_id('WebSitePWDCert'),ini_binary,N's#29&^*@!q'))
    from  ini_file
 where  ini_name ='ACCESS'
GO
 
-- insert new record using new certificate
INSERT INTO ini_file (ini_name,ini_binary)
VALUES ('Access',EncryptByCert(cert_id('WebSitePWDCert'),'473429382900'))
GO
 
--Execute same select query. Works just for that one record that was just inserted.
  select convert(varchar(max), 
             DecryptByCert(cert_id('WebSitePWDCert'),ini_binary,N's#29&^*@!q'))
    from  ini_file
 where  ini_name ='ACCESS'
GO
[+][-]05/14/09 12:33 AM, ID: 24382395

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About this solution

Zone: SQL Server 2005
Tags: Sql Server 2005
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Solution Provided By: mark_wills
Participating Experts: 1
Solution Grade: A
 
 
[+][-]05/15/09 12:42 PM, ID: 24399071

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[+][-]05/15/09 01:27 PM, ID: 24399414

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