SIM playing cards are throughout us, and with the persevering with progress of the Web of Issues, spawning applied sciences like NB-IoT, this may as effectively be very literal quickly. However what do we actually find out about them, their inside construction, and their communication protocols? And by extension, their safety? To shine some mild on these questions, open supply and cell system titan [LaForge] gave an introductory talk about SIM card technologies on the 36C3 in Leipzig, Germany.

Beginning with a short historical past lesson on the early days of mobile networks primarily based on the German C-Netz, and the origin of the SIM card itself, [LaForge] goes by the primary specification and know-how elements of every following era from 2G to 5G. Overlaying the bodily fundamentals, I/O interfaces, communication protocols, and the file system situated on the SIM card, you’ll get the reply to “what on Earth is PIN2 for?” alongside the way in which.

After all, a chat like this, on a CCC occasion, wouldn’t be full with out a deep and demanding take a look at the safety aspect as effectively. Contemplating how over-the-air updates on each software program and — because of principally operating Java these days — characteristic aspect are an increasing number of frequent, there actually is one thing to take a look at.

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