If you pass the device on to friends and trust the people, deleting the iPhone in this way is completely sufficient. Here are the instructions for iOS in brief: If you want to delete using the on-board tools of iOS, go to "Settings" -> "General" -> "Reset" (at the bottom!) -> "Delete content & settings". Here it is indeed advisable to overwrite the data several times. However, a jailbroken iPhone is a security flaw, because here a large part of the encryption is bypassed and the data is stored in clear text on the device. Whereby you have to say that with the iPhone 6 too NSA and Co no longer have a chancebecause the encryption is so strong it would take over 5 years to crack the code. The brute force attack is more likely to correspond to the approach of the NSA or BND. For private individuals, however, this is unlikely to be an option, because which private person is already so interested that he plowed the cell phone of his previous owner with a computer for months and years in order to find out possibly intimate details. Theoretically, however, this is still possible if you carry out a with a lot of computing power and automatically try out many keys until you get recognizable data. If the device is reset via the settings, the key is "thrown away" and the data on the device can no longer be restored without the key. But this is also due to the fact that every iOS device itself encrypts its data. Reset iPhone via iOSĪpple offers the option of resetting personal data and settings via iOS in order to restore the iPhone to the delivery state, but the memory is not overwritten multiple times. This procedure prevents old information from being restored somehow and this is how you proceed when you use the US security standard US DoD 5220.22-M want to meet. The data can only be classified as technically irretrievable if they have been overwritten three times with random new data. Sir Apfelot recommendation: Clean up your Mac hard drive with CleanMyMac Correctly delete by overwriting the memory several times Here's just a quick reference to one Article on, which is about "identity theft" on the Internet. Until this is done, however, you can use special software to restore photos, messages, documents and emails and do all sorts of things with sensitive data that the previous owner certainly does not want. The data itself remains on the hard drive or in the flash memory until the file system requires the space and the corresponding locations in the memory are overwritten. This is possible because the normal deletion does not actually overwrite the data, only the management entries in the index file of the file system are removed. What many are not aware of, however, is the fact that savvy people are quite capable of restoring the supposedly deleted data from many smartphones. Most smartphone users now know that they should delete their personal data before selling their used iPhone so that they do not experience any nasty surprises. There have been several embarrassing moments when iPhone owners have sold their old device and the new owner finds intimate photos, still receives messages from the previous owner via the messaging app or finds other sensitive data on the device.
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