Encrypt And Decrypt Text Format Data

Oct 19, 2007

Hi,

We have migrated a CRM Database from SQLServer 2000 to SQLServer 2005.



Database contains very sensitive data about customer in text format (Datatype varchar(20)) how can i encrypt the same without any change in the table design.



Regards
Sufian


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Encrypt/decrypt Data

Nov 16, 2004

We like to secure datas.
Only a few people are autorized to read this information, but today, these informations are readable with a simple query with a query analyzer for exemple.

I'd like to encrypt datas with reversible function in one field of a table

Is there a function able to do this kind of work in SQLServer V7 or 2000 ?

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(I know sql does accept extended ASCII characters)

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Hi,
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like for example i have this query statement below

insert username,password users values ('daimous','my_password')

what i want is every time i insert a value to the password column that value should be encrypted first.


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everytime i select the value of the password column should decrypted.
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Hi there,

Using symmetric keys and certificates in SQL2005, can one assign users permission to only decrypt or encrypt data?

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I've got a field I'm trying to convert into a date format as it currently sits as a text field. The date setup is of the format DD/MM/YYYY. Some of the fields are NULL, however for the sake of filling in gaps I've just set the nulls to '01-01-1905'.

I've tried to use CAST to change the data into a readable format for SQL Server however I tend to get one of two messages:

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-Or-

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I understood that sql 2005 has EncryptByCert(varchar) function to encrypt data field. but varchar is limit by 8,000 chars long.

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Jan 19, 2007

Hi... I want to encrypt data using a symmetric key + certificate, but it appears anyone with simply "db_datareader" can view the decrypted data? Is this correct?

Recreation steps:

1. As a System Admin, log into a SQL 2005 Database Engine.
2. Create some login that you also have access to. Ensure it does not already exist, or inherit any permissions from some existing NT-group. (From here on out, I will refer to it as the "underpriveleged user".)
3. Create a new database of any name.
4. Run the following query against the database:

CREATE TABLE [dbo].[MyTable](
[MyColumn] [varbinary](50) NULL
) ON [PRIMARY]
GO
CREATE USER [DOMAINUserName]
FOR LOGIN [DOMAINUserName] WITH DEFAULT_SCHEMA=[dbo]
sp_addrolemember 'db_owner', 'DOMAINUserName'

5. Now open another SSMS and connect as that underpriveleged user.
6. Change the database to the name you provided in Step 3.
7. Run these commands as the underpriveleged user...

CREATE MASTER KEY ENCRYPTION BY PASSWORD='DbMK_pwd'

CREATE CERTIFICATE MyCertificate WITH SUBJECT='Some Text'
CREATE SYMMETRIC KEY MyKeyName
WITH ALGORITHM = DESX
ENCRYPTION BY CERTIFICATE MyCertificate

OPEN SYMMETRIC KEY MyKeyName
DECRYPTION BY CERTIFICATE MyCertificate
INSERT INTO MyTable(MyColumn)
VALUES (EncryptByKey(Key_GUID('MyKeyName'), 'MyValue'))
SELECT Convert(varchar,DecryptByKey(MyColumn)) FROM MyTable
CLOSE SYMMETRIC KEY MyKeyName

8. Now switch back to the System Admin session, and revoke most of the underpriveleged account's permissions...

sp_droprolemember 'db_owner', 'DOMAINUserName'
GRANT SELECT ON dbo.MyTable TO [DOMAINUserName]

9. Switch once again to the underpriveleged session, and run the following:

OPEN SYMMETRIC KEY MyKeyName DECRYPTION BY CERTIFICATE MyCertificate
SELECT *, Convert(varchar,DecryptByKey(MyColumn)) FROM MyTable
CLOSE SYMMETRIC KEY MyKeyName


Why does this work? The user only has select access against the table, and no explicit permissions to the certificate or key. I have even disconnected as this user, tried again, restarted SQL Server... it is still able to decrypt the text.

Or what should I be doing to ensure only those with access to the key/certificate can decrypt the cipher text?

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Hi All,
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Can any one help?

Thanks,
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Jan 8, 2007

Hi,

In SQL2000 i need to Encryptdata when I export data using DTS.LikeWise I should when i import data I should authenticate that user and decrypt that.

Can any one help?

Thanks,

Karthik



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J827

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Sep 12, 2007

Hi,

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select * from users where userid=454 and password = 'encrypted data'

The mechanism to encrypt data could be in a .net application. The code that does encryption/decryption should also be protected so that it doesnt work if it falls in wrong hands.

Can anyone suggest what would be the best way to accomplish above?

thanks,
dapi

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Jul 11, 2006

I am trying to insert data in a table using a stored procedure, but somehow I cannot store the values passed by the stored procedure in the table.

Table has two fields FIRST_NAME, LAST_NAME with varbinary data type(I need to encrypt the data)

My stored procedure is as follows. Please let me know what i am doing wrong!

***************************************************************

ALTER PROCEDURE [dbo].[SP_InsertInfo]
-- Add the parameters for the stored procedure here

@FIRST_NAME varBINARY(100)
,@LAST_NAME varBINARY(100)

AS
OPEN SYMMETRIC KEY key DECRYPTION BY CERTIFICATE cert

BEGIN

SET NOCOUNT ON;

-- Insert statements for procedure here


Insert into [dbo].[INFO] (FIRST_NAME, LAST_NAME)
Values ( encryptbykey( key_guid('key'),'@FIRST_NAME'),
encryptbykey( key_guid('key'),'@LAST_NAME')
)
close SYMMETRIC KEY key

END

**********************************************
EXEC sp_InsertInfo 'larry', 'Smith'

when I run the SP, the data stored in the first_name, last_name fields are @FIRST_NAME', @LAST_NAME' instead of larry, smith respectively.

Thanks

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Oct 1, 2007

Hopefully this makes sense, not sure what to even begin researching...

I'm trying to optimize all facets of this process, as it will take over the resources on my server if not done efficiently.

I have CSV files containing INTs that I need to upsert (match to an existing/earlier imported array or create a new record set) millions of times a day. To be clear, this data is a small subset of the actual import, this arrays contents are not the main data of the process, and the value of the entire array is meant to be related to higher level tables.

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