![]() ![]() However, this also means that when a file is deleted, its encryption key is deleted alongside it, effectively erasing it entirely. This form of encryption uses different keys for different files, meaning they can be unlocked independently of each other. In the case of a factory reset, all files stored using full-disk encryption are erased and completely irretrievable.Īndroid 7.0 and up feature file-based encryption instead. This form of encryption uses a single 128-bit Advanced Encryption Standard (AES) key which is securely stored on the device (protected by the user’s password). So, while the data isn’t overwritten, it’s still technically retrievable – or it would be if the disc wasn’t encrypted.Īndroid 5.0 to Android 9 utilize full-disk encryption. The original data is then replaced when a new file is saved, overwriting it. Instead, the location of recently deleted files is marked as overwritable. ![]() In most phones (and storage devices), when files are deleted they aren’t actually erased. ![]()
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