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Re: SMS Banking
From: "Thor (Hammer of God)" <Thor () hammerofgod com>
Date: Wed, 10 Feb 2010 19:15:52 +0000

I don't know who all those other guys were, and since everything on FD gets replicated, I'll just keep it here.  SANS 
has dropped out, so it's just you and me, kid.

The "initially proposed tasks" were what YOU said, not me.  You calculating the propensity for some package to have a 
software vulnerability over time is NOT calculating risk.  Again - this is YOUR words, not mine:

"Where a system uses an SMS response with a separate system (such as a web page), the probability that the banking user 
is compromised and a fraud is committed, P(Compromise), can be calculated as: P(Compromise) = P(C.SMS) x P(C.PIN)
Where: P(C.SMS) is the probability of compromising the SMS function and P(C.PIN) is the compromise of the user 
authentication method"

You say you can model the probability of compromise with a formula.  I say you can't.  Period, end of story.  I said 
let's debate it.  You said you won't unless I pay you.  Then you bet me $10,000 while trying to say you can model 
software vulnerabilities and then said you can put up a system that I can't hack in 6 months after upping the bet to 
$100,000.  

It's all there in black and white.  In writing.  

Are we all here to understand that it takes the greatest mind in the world and the most highly certified computer 
professional on the face of the globe to understand that a system becomes less secure over time when left alone and 
that the more people that use it the less secure it becomes?  Really?  That is your contribution?

You won't wiggle out of this one, sir.  You've bet $100,000 that you can put up a system that can't be hacked.  You've 
staked your reputation on the fact that you can use a calculator to determine the probability of a system being 
compromised. Please note that *I* don't even have to hack it.  In fact, I plan on being on a beach somewhere after 
offering $10,000 for someone to hack it for me.  There are about 1 billion people in China would could use $10,000.  
But that's another story. 

I further predict that this is about the time that you'll say "oh, no, I didn't say that" and that I somehow agreed to 
your silly "choose 50 or 100 packages and I'll model code vulnerabilities instead."  Once everyone here replies back 
saying "dude, you are changing your tune" you'll whimp out, and rescind the bet, and crawl back into your academic 
womb. 

If not, produce the contract stating that you will pay me $100,000 if your system gets hacked "any way I choose" and 
that you can calculate risk of compromise with a formula.  

t





-----Original Message-----
From: Craig S. Wright [mailto:craig.wright () Information-Defense com]
Sent: Wednesday, February 10, 2010 10:54 AM
To: Thor (Hammer of God); 'full-disclosure'
Cc: pen-test () securityfocus com; security-basics () securityfocus com;
stephen () sans edu; 'Jeff Frisk'; 'Ben Wright'
Subject: RE: [Full-disclosure] SMS Banking

" You are changing the bet in mid-stream "
Not at all. This was and is the bet. The initially proposed 2 tasks
remain
unchanged.

The statement on SMS was that this is a time degrading risk function.
That
is, the proposed SMS solution would become less secure over time. The
longer
it ran, the more attacks. It would also be a function of users, the
more
users, the less secure. In case you cannot understand what the SMS
quote you
have means, it simply means that adding an independent 2nd factor
lowers the
inherently high risk of a purely SMS based system.

"The risk of deploying any given solution takes into account FAR too
many
real-world elements than any formula can address. "
The SMS formula is not the be all - it was a simple extrapolation based
on a
highly insecure proposal. My model as I have put it is an expert
system. The
risk associated with each application on a system is derived as with
dependence and path.

Please as stated, choose the 100 software applications.

Regards,
...
Dr. Craig S Wright GSE-Malware, GSE-Compliance, LLM, & ...
Information Defense Pty Ltd


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