funsec mailing list archives

Re: PayPal Plans Payments Via Text Message?


From: "Mark P. Fister" <mark () fister org>
Date: Fri, 24 Mar 2006 01:43:06 -0800

On Thu, Mar 23, 2006 at 08:56:34AM -0700, Justin Polazzo wrote:
How do you guys originally tie a number to a cell phone? Via
registration on the web with an acknowledgement sent to the cell phone
via SMS?

 *** DISCLAIMER ***

Anything I say is subject to change, as the system is currently in beta.

*** END DISCLAIMER ***

Verification of the phone number is how the system ties the account to the
cell phone.  In fact, the phone number doesn't have to be a mobile phone. If
not a mobile, you can make payments by calling a 1-800 number (although that's
far less sexy).

Regardless, after registering the phone number and choosing a PIN on
PayPal's web site, PayPal simply calls your telephone number with an automated
voice system.  At that point, you enter the PIN you chose.  This verifies that
the telephone number is yours.

Now, you can begin sending money via SMS or the 1-800 number.

         I guess that would mean in order to sign up for the service,
you would already have to have full access to the paypal account,
therefore making it just as (in)secure as any online transaction ;-)

You might want to take an advance lesson from these guys.
http://www.theregister.co.uk/2006/02/02/mobile-phone_tracking/

It seems that people were abusing the system, trying to track those who
didn't want to be tracked via more methods than are listed in the above
link. You cant stop all security flaws (social or technological), but
the idea of always texting the phone with notices that you are signed up
to the service, or when you fail authentication, or just make a huge
purchase might be able to stop some current and future headaches. And
while it may be annoying to some, it might also be comforting to others.

Yes, the system does text back when you:

1. Sign up.
2. Make a payment via your mobile device.

Furthermore, PayPal will email you a receipt at your email address on file
when you make a telephone payment.  Naturally, all payments you make via your
registered phone will also show up in your payment history, downloadable logs,
and SOAP results.

-JP

-- 
Mark P. Fister
http://www.fister.org
Skype: callme://FisterDotOrg
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