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Is it possible to use a flash drive encrypted with LUKS and connected to the phone with an USB OTG cable?

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  • Yes if 1) your device is rooted and 2) your kernel is built with CONFIG_DM_CRYPT. The latter is necessarily true if your device supports FDE. So decrypt and mount the USB OTG using cryptsetup or dmsetup as you would do on any Linux PC.
    – Irfan Latif
    Commented Aug 26, 2022 at 17:40
  • Maybe an app like EDSLite or the full EDS could be helpful, too – though I'm not sure if they'd work with entire volumes (the app description just speaks of containers, but explicitly mentions LUKS). Nevertheless, root seems indeed needed. And right: their website mentions "Encrypted partitions and devices support" for the full version, root needed.
    – Izzy
    Commented Aug 26, 2022 at 20:41

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