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This setup only allows you to tap and possibly inject (if you add the RX wires) into the communication between a modem and SIM. All of this seemed really cool and new, but it's rather trivial when trying to hack with hardware.

5 x 1uF/25V (Wolfgang says 1uF, they should work fine too) capacitorsДЇollow the instructions on SparkFun's beginning electronics tutorial to build the power supply, and you should have all the knowledge needed to read the SIM to MAX32-RS232 diagram on Wolfgang's site.

Or you can purchase a MAX232 kit (shop around though), but this is about learning, let's DIY! Add to the shopping cart: Luckily you can also get these from SparkFun.

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The MAX232 IC, 5Г— 1uF capacitors, and a female serial (RS232) adapter. However! Using any MAX232 wiring layout, but in this case check Wolfgang's site, you'll see we need a few more goodies.

Ok back on track! The beginning electronics kit will provide a breadboard to prototype, a DIY power supply, and some hookup wire. I've become a huge fan (like everyone else) of SparkFun after my UAV experiments, so shopping for parts this time around was quite refreshing.

SparkFun: Beginning Embedded Electronics - Power Supply Kit.

Tapping SIM card overview: Wolfgang Rankl - Things for Smart Cards (some German).If you're following along, here are some links: I'll show them little chance for failure! They assured me this was a very easy project, with little chance for failure. Well, my hardware-savvy friends from UDel's CVORG research group gave me a little hand holding and pointed me towards a book and a beginning electronicsвЂ™ kit. Good news, SIM I/O outputs as a TTL protocol, which can be converted (from +0,1.8 to +3,5V) into serial (from -15,-5 to 5,15V) using a MAX232 integrated circuit (IC). Why? I learned from s7ephen's presentation, most hardware protocols can be read over serial. Step 2: Google like crazy to find out if it's possible to read SIM I/O over serial (RS232). If you have the same curiosity, for a more universal fit, try an eBay search for ' SIM Card Extender', and use that I/O connector pin. So I soldered a lone wire to the SIM I/O connector pin on the board.

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The first question that happened in my brain was how to MitM SIM communication? Step 1: can I tap SIM card to modem communication? Luckily I had some artifacts from my experiments with UAVs, specifically a USBMA and several MiniPCIe modems. Let me try to follow my thought process here, bare with me please. Well, not nope, but it's not that easy.ДЄs I crept around on Google I discovered two things, 1) the Germans love their SIM/Smart card technology, and 2) SparkFun is an awesome website.

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I quickly arrived at SIM card hacking and like a young schoolboy thought, 'man if only I could MitM the hardware communication I could spoof other's SIM cards and use free Internet!' Nope. A few months ago I took an interest in the layer 2/3 protocols (and their implementations) for mobile networks.

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