Encrypted Database Transfer Problem
Apr 4, 2006
Hi,
I have encrypted some columns of a table in a database. Following is the method which i applied for encryption.
I created a master key with a password and it is also encrypted by service master key.
Now i created a certificate without password, so it is only encrypted by master key of the database.
Now i created a symmetric key encrypted by the above certificate.
The data is encrypted by this symmetric key.
To decrypt data i use DecryptByKeyAutoCert.
On my server this encryption & decryption is working perfectly.
But when i take this database to another server, it is not working.
What is the solution for this, should i drop service master key to encrypt master key or is there any soln.
Thank you.
Pls give me soln. i am worried abt it.
Gaurav
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Jan 23, 2006
I need to start encrypting several fields in a database and have been doing some testing with a test database first. I've run into problems when attempting to restore the database on either the same server (but different database) or to a separate server.
First, here's how i created the symmetric key and encrypted data in the original database:
create master key
encryption by password = 'testAppleA3';
create certificate test
with subject = 'test certificate',
EXPIRY_DATE = '1/1/2010';
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
open symmetric key sk_Test decryption by certificate test;
insert into employees values (101,'Jane Doe',encryptbykey(key_guid('sk_Test'),'$200000'));
insert into employees values(102,'Bob Jones',encryptbykey(key_guid('sk_Test'),'$500000'));
select * from employees
--delete from employees
select id,name,cast(decryptbykey(salary) as varchar(10)) as salary from employees
close all symmetric keys
Next I backup up this test database and restore it to a new database on a different server (same issue if restore to different database but on same server).
Then if i attempt to open the key in the new database and decrypt:
open symmetric key sk_Test decryption by certificate test;
I get the error: An error occurred during decryption.
Ok, well not unexpected, so reading the forums, i try doing the below first in the new database:
ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY
Then I try opening the key again and get the error again:
An error occurred during decryption.
So then it occurs to me, maybe i need to drop and recreate it so i do
drop symmetric key sk_test
then
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
and then try to open it.
Same error!
So then i decide, let's drop everything, the master key, the certificate and then symmetric key:
drop symmetric key sk_test
drop certificate test
drop master key
Then recreate the master key:
create master key
encryption by password = 'testAppleA3';
Restore the certificate from a backup i had made to a file:
CREATE CERTIFICATE test
FROM FILE = 'c:storedcertsencryptiontestcert'
Recreate the symmetric key again:
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
And now open the key only to get the error:
Cannot decrypt or encrypt using the specified certificate, either because it has no private key or because the password provided for the private key is incorrect.
So what am I doing wrong here? In this scenario I would appear to have lost all access to decrypt the data in the database despite restoring from a backup which restored the symmetric key and certificate and i obviously know the password for the master key.
I also tried running the command
ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY
again but this does not resolve the issue.
Thx.
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Apr 20, 2005
Hi everyone,
I am currently reading ASP.NET unleashed and practising few examples. The following code converts a user's text into a symmetric encryption:
'nd: define keys
Const DESKey As String = "ABCDEFGH"
Const DESIV As String = "HGFEDCBA"
'nd: convert string to byte array
Function convert2ByteArray(ByVal strInput As String) As Byte()
Dim intCounter As Integer
Dim arrChar As Char()
arrChar = strInput.ToCharArray
Dim arrByte(arrChar.Length - 1) As Byte
For intCounter = 0 To arrByte.Length - 1
arrByte(intCounter) = Convert.ToByte(arrChar(intCounter))
Next
Return arrByte
End Function
Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
Dim arrDESKey As Byte()
Dim arrDESIV As Byte()
Dim arrInput As Byte()
Dim objFileStream As FileStream
Dim objDES As DESCryptoServiceProvider
Dim objEncryptor As ICryptoTransform
Dim objCryptoStream As CryptoStream
'convert string to bytes
arrDESKey = convert2ByteArray(DESKey)
arrDESIV = convert2ByteArray(DESIV)
arrInput = convert2ByteArray(txtInput.Text)
objDES = New DESCryptoServiceProvider
'pass keys
objEncryptor = objDES.CreateEncryptor(arrDESKey, arrDESIV)
'create to file to save password
objFileStream = New FileStream(MapPath("secret.txt"), FileMode.Create, FileAccess.Write)
'pass in file and keys
objCryptoStream = New CryptoStream(objFileStream, objEncryptor, CryptoStreamMode.Write)
'pass in text
objCryptoStream.Write(arrInput, 0, arrInput.Length)
objCryptoStream.Close()
lblDone.Text = "Done!"
End Sub
It works fine. But, how to i save this encrypted password into a database field instead of a writing it to a file? Also, could some please tell me how to paste code into this forum? I tried <code></code> tags but it did not work.
Many thanks,
Kevin
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Dec 10, 2014
I have an encrypted database in server A. The reporting service is running on server B. I deployed all my reports to Server B. When I run the reports, I got the following message:
The report server cannot decrypt the symmetric key that is used to access sensitive or encrypted data in a report server database.
I googled the problem, some said to backup the key, but when I opened the reporting service configuration tool to backup the encrypted, it said I needed to restore the key first. Some said I need to delete the key, but that defeated the purpose of an encrypted database.
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May 5, 2015
I am executing a stored procedure in one database (Database1) that pulls data from another database (Database2) that is the back end for a third party application. Some of the fields in that other database are now encrypted. I need to decrypt those fields but since the query is running in a database other than where the data lives (which is also where the symmetric key + cert lives), I am getting the following error: "Cannot find the symmetric key" Below is an example of what I am running in the stored procedure:
OPEN SYMMETRIC KEY [XXXXKey] DECRYPTION
BY CERTIFICATE [XXXX_CERT];
select CONVERT(Varchar(50), DECRYPTBYKEY( <ENCRYPTED FIELD> ))
FROM Database2.dbo.TABLE1
CLOSE SYMMETRIC KEY [XXXXKey];
What do I need to add to Database1 so the stored procedure can decrypt the data it pulls from Database2?
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Jan 25, 2007
Hi,
I have database with encrypted column data in my customer server. Sometime, I might need to backup their database back to office for troubleshooting.
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Thank you
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I queried sys.databases in one of the sql server and found "is_encrypted" is "1" for four of the databases.
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Note :- I can see backups of key in a particular folder.
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The option:
SQL Server Configuration Manager>SQL Server Network Configuration>Protocol for SQL_xxx (right click)>Properties, we can see two Tabs:
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Or Force Enctyption has to be enabled in order to hide instance?
What is the recommend settings?
[URL]
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Mar 21, 2007
Hi all,
I am developing an application for a big office which uses SQL Server 2000.
Apart from my database, on that server, there are two databases by other companies.
The administrator also has access to server but the client only wants him to backup the database.
I have two questions:
1) First of all (if it is possible) I would like to protect my own database from the other companies.
I don't want them to:
see the data in the tables (around 20 tables)
make changes to the stored procedures (more than 100 stored procedures)
be able to backup the database
2) The client will save sensitive data to the database (mainly currency amounts, salaries etc) which he wants to keep hidden.
I am using float type for these fields and I would like to make the data encrypted. I could do it for nvarchar fields but changing these float to nvarchar would be time consuming.
Thanks for your patience reading this!
Would really appreciate some help on any of these
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I've a SQL server 2014 running on one of our server. We're in the process of implementing security steps for our databases. I've encrypted a column in one of the table in the database on the server. The issue is when I restore the backup on my local SQL server and run a query to decrypt the column data it gives me null values. On the other end when I decrypt the column data on the main server it works fine. I found a thread on this forum which states to do the following when restoring the encrypted database on different server.
USE [master];
GO
OPEN MASTER KEY DECRYPTION BY PASSWORD = 'StrongPassword';
ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY;
GO
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