< March 2006 >
    1 2 3 4
5 6 7 8 91011
Tue, 07 Mar 2006:

I used to work on a mobile phone product. Once you start sitting down and reading through the various specs around, you start to realize that most basic designs for mobile phone protocols were built more like the internet was. If you've read The Art of Deception which talks about something called Speakeasy security. The concept dates from the prohibition era in the US, where if you showed up at the right place and spoke the right lingo, you were in. So let's apply the same theories here (no code here).

the place: SMSc numbers aren't that hard to find. In fact, they are published and exchanged between the cellphone companies for routing. For example, Airtel Karnataka's SMSc would be 98450 870xx *. You can easily check it with a simple AT command.


< +CSCA="+9198450870xx",145
< OK

secret knock: you need to see if this allows you to call up directly. To send an SMS with a fake sender, you need to be able to access it using the EMI/UCP protocol. The specification has provision for login operations, but few SMSC's actually enable strict authentication.

right lingo: You could mess around with Net::EMI::Client perl script to generate all your PDU data. Otherwise that protocol is just padding hell to generate easily. Technically it is child's play to actually dial out to the SMSc push out the PDU you want and then just wait for people to get messages with *interesting* sender numbers (42-31337-31337, anyone ?).

All this is common knowledge in the GSM services world. You just need to know what to look for and then a few bits & peices on how to use it with a desktop.

The reader this message encounters not failing to understand is cursed.

posted at: 16:44 | path: /hacks | permalink | Tags: ,

Finally, Rich333 appeared back on #dotgnu - of course, while I was away.

<scandium> and a few days ago I think t3rmin4t0r said that he's going to look at it to get 
           the interpreted mode of libjit right
<Rich333>  so the chances of him helping with libCrayons instead of making smug blog comments
           about it are zero... perfect
<Rich333>  thank the gods

So let me make yet another smug comment about libCrayons while I'm at it. Heh, just kidding. I've been slacking for a while lately, I've been working on XPath which nobody around really needs that badly. Richard has been hacking away like mad on the crayons code. I just did a diff of the commit he made yesterday.

   libCrayons/ 2006-03-06   +6774 -2673

I'm sure that he's been under-appreciated for all the effort he has put into pnet. Praise, where praise is due... [in other words - w00t, Rich333 r0cks]

Also if anyone's interested in helping (come on !), just give #dotgnu a raise and see if you're any good at low level graphics magic. You'd probably learn more about how UI systems work in two months than years in a classroom. And that's a promise.

The trouble with opportunity is that it always comes disguised as hard work.
               -- Herbert V. Prochnow

posted at: 16:14 | path: /dotgnu | permalink | Tags: ,