After that, it was simply a matter of typing in a password up to five times-then refreshing the Nand chip-over and over again, until he found the right code. He also had to reverse-engineer the communications system to learn how to get the mirrored chip to talk to the iPhone. In practice, the technique was a little more complicated than it sounded-Skorobogatov had to use a solder gun to heat the glue holding the chip in place to remove it without causing damage. The technique was simple: Skorobogatov simply mirrored the iPhone's Nand chip and then reprogrammed it to allow for resetting the counter that keeps tabs on how many times someone attempts to enter a password-the iPhone only allows six tries and if the user persists to 10 tries, the phone erases device data-this allowed him to manually try every possible combination of a four number password until he hit upon the one that was correct-a process he says that would take 40 hours on average. Now it appears they could have saved a lot of money if they had contacted Skorobogatov instead-he has found a way to crack the password of an iPhone using off-the-shelf parts that cost under $100. Earlier this year, it was widely reported that the FBI paid an unknown company $1 million to crack the password of an iPhone used by terrorists known as the San Bernardino shooters.
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