Index Of Encrypted Field

Jan 15, 2008

I created Encryption by passphrase . The data type of the encrypted field is varbinary(MAX). Now I want to make one Index on this filed. Name of the encrypted colum is ''Encrypted Account Number' " and the name of the table is "S3schema-Test". The value of ''Encrypted Account Number" is unique. I wrote the following T-sql code :-

CREATE CLUSTERED INDEX [IDX_Encrypted Account Number1]

on [S3schema-Test] ([Encrypted Account Number])

But I am getting following errors:-
Column 'Encrypted Account Number' in table 'S3schema-Test' is of a type that is invalid for use as a key column in an index.

Any Idea, how to fix this error?

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Aug 17, 2006

I have read recommendations about searching encrypted data. Typically, they involve creating a MAC (message authentication code) table. One of the elements of that table is a HASH of the encrypted data (plus a Mac key) that is used as an index for searching. Is that HASH as secure as the encrypted data itself, or is this approach less secure? If it is less secure, then may I assume that approach is the only feasible way to search data encrypted by nondeterministic algorithms?

TIA,

Barkingdog

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May 17, 2006

I have a table which includes an encrypted field. In the following statement...

select cast(decryptBykey(Column2)as varchar(max)) as column2new, column1 from testtable where cast(decryptBykey(Column2) as varchar(max))=@p1

I retrieve the (now decrypted) secure column as well as another column and then filter the results by a parameter on the (now decrypted) secure field.

Furthermore, if I wanted to sort on the encrypted field, I would once again have to call the cast(decryptbykey... function. It seems to me that this kind of statement would perform poorly since I have to call the same function numerous times. Is there a way to call this function once and then reference the resultant field value throughout the rest of the statement?

I assume that this situation is the same if I call any SQL function to alter a field value..not just the decryptbykey function

Thanks,

Al

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To trick the sorting I use a calculated field:

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convert(varchar(4), RD.response) as RSort

It works but put a high load on the SQL server when the number of responses increases.

I though of making a non clustered index based on the calculated field, but is not sure that it will work as intended.

What do I do. The last thing would be to change the ntext to vchar(3800) or something like that. :confused:

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Thanks, Al

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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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This is a small sable code:
------------------------------------------------------------------------------------------------
CREATE TABLE dbo.Users
(
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PassWord nvarchar (50) NOT NULL
)

GO

INSERT INTO USERS (User_Name, PassWord)
VALUES ('MyName', {Encrypt N 'MyPassWord'})

GO

INSERT INTO USERS (User_Name, PassWord)
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GO

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(2 row(s) affected)
-------------------------------------------------------------------------------------------------
Unfortunately both (All) rows are return

Is it any way to encrypt password and be able to select them?
Is it any other way to encrypt data into the database?

Thank You

Elias

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