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Re: A better Linux based firewall installation?



On Wed, 29 Nov 2000, Ilya Konstantinov wrote:

> On Wed, Nov 29, 2000 at 12:50:32PM +0200, Gilad Ben-Yossef wrote:
> > Other methods of configuration could be very well added. How about 
> > attaching an GSM phone to the machine and accepting instruction only 
> > from SMS messages coming from a certain phone number.
> 
> That's a rather insecure way, BTW.
> Any company with direct access to the GSM exchange can create
> messages with whatever source numbers they want.

Nope: as long as your number is unlisted, and you require the a short
key at the beginning of a message, the intruder will have to guess
source number + target number + 4 digits key.
If you also require a 30 seconds wait after 5 unsuccessful attempts,
then the most they can do is DOS your phone...but DOSing is something
pretty much unavoidable with anything that doesn't require physical
access.
--
Moshe Zadka <moshez@math.huji.ac.il> -- 95855124
http://advogato.org/person/moshez


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