Обсуждение: Fwd: Hiding data in postgresql

On Tue, May 25, 2010 at 3:39 PM, Hector Beyers <hqbeyers@gmail.com> wrote:
>
> Hi guys,
> (I tried the question in another forum first)
> Does someone have any ideas how I can hide data without the meta data
> noticing? To explain further, I would like to save some collection of data
> where the meta-data does not see it. I am trying to do some security through
> obscurity. It is for research purposes.
> For example, populate a table with 1000 rows, but the meta-data only knows
> of about 500 of them? Only on an export of a dump can you find all the data
> again. Or maybe to make a hidden duplicate schema that can point to the
> hidden data?
> Does someone have any good ideas on how to achieve this or something
> similar?
> Kind regards
> Hector
>
>
> On Mon, May 24, 2010 at 9:16 PM, Hector Beyers <hqbeyers@gmail.com> wrote:
>>
>> Hi guys,
>> does ANYONE have any tips on hiding data on a database server? This means
>> that data is stored in places that is not necessarily picked up in the
>> schema of the database. I am doing some research on databases and need some
>> direction.
>> Any help or direction will be highly appreciated.
>> Kind regards
>> Hector

Not sure if this helpful, but be sure to know about views, which can
be used to filter out rows of a table.  Example:

CREATE TABLE foo (name TEXT, visible BOOL);
INSERT INTO foo VALUES ('two', true);
INSERT INTO foo VALUES ('three', true);
INSERT INTO foo VALUES ('four', false);
INSERT INTO foo VALUES ('five', true);
INSERT INTO foo VALUES ('six', false);
INSERT INTO foo VALUES ('seven', true);
INSERT INTO foo VALUES ('eight', false);
INSERT INTO foo VALUES ('nine', false);
INSERT INTO foo VALUES ('ten', false);
INSERT INTO foo VALUES ('eleven', true);

CREATE VIEW foo_view AS SELECT foo.name FROM foo WHERE visible=true;

=> SELECT * FROM foo; name  | visible
--------+---------two    | tthree  | tfour   | ffive   | tsix    | fseven  | teight  | fnine   | ften    | feleven | t
(10 rows)

=> SELECT * FROM foo_view; name
--------twothreefiveseveneleven
(5 rows)

Note that views are SELECT-only, but you can use CREATE RULE to
simulate an updatable view.

You may also want to read about Veil:
http://veil.projects.postgresql.org/curdocs/main.html

Hector,

* Hector Beyers (hqbeyers@gmail.com) wrote:
> Does someone have any ideas how I can hide data without the meta data
> noticing? To explain further, I would like to save some collection of data
> where the meta-data does not see it. I am trying to do some security through
> obscurity. It is for research purposes.

This explanation doesn't actually explain anything, near as I can tell.
Perhaps if you would share what your actual problem is, we could
recommend a solution.
Thanks,
    Stephen