Re: [SQL] How to index encrypted colums ?
Hi
Here is my answers to your remarks :
>>
I believe that Klaus is trying to tell you that if you create an index on an encrypted column, you are storing the encrypted data in plaintext within the index. An attacker can access the secure data via the index instead of the column.
<<
I am not sure about this. If I index the field without deciphering it and make the query by encrypting the search string. This permits not to expose the password or the encryption key in the definition of the index.
To do this, I need to use the encrypt () and decrypt () raw encryption functions which are immutable. With identical parameters, they always return the same value and can be used to index an encrypted column.
>>
I suppose you could partially mitigate this by putting the index in a separate table space and putting that table space on a virtual disk device that is encrypted.
But if that meets your needs why not just put the whole table on that encrypted table space and leave the column unencrypted inside Pg?
<<
Interesting recommendation, but it seems too complex for us.
Best Regards
Didier ROS
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Envoyé : mardi 17 octobre 2017 16:15
À : ROS Didier <didier.ros@edf.fr>
Cc : pgsql-sql-owner@postgresql.org; pgsql-sql@postgresql.org
Objet : Re: [SQL] How to index encrypted colums ?
On Oct 17, 2017 12:49 AM, "ROS Didier" <didier.ros@edf.fr> wrote:
Hi Klaus
We need encryption because we need to protect sensitive data. I need to create an index on encrypted columns and I don't know how to insert private key.
Example:CREATE INDEX cartedecredit_cc_idx ON cartedecredit(pgp_pub_decrypt(cc, '--------'));
I believe that Klaus is trying to tell you that if you create an index on an encrypted column, you are storing the encrypted data in plaintext within the index. An attacker can access the secure data via the index instead of the column.
I suppose you could partially mitigate this by putting the index in a separate table space and putting that table space on a virtual disk device that is encrypted.
But if that meets your needs why not just put the whole table on that encrypted table space and leave the column unencrypted inside Pg?
Steve
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