Florian Kulzer wrote: > The main advantage of pmount is that it allows all members of the > "plugdev" group to mount pluggable devices. This eliminates the need to > add entries for pluggable devices to /etc/fstab. Since I use pmount > anyway I like the fact that it automatically recognizes LUKS partitions > and asks for the passphrase.
Sounds good. Does that mean that as soon as I plug my disk into the USB slot, it gets recognized and I get asked for the passphrase? Does it automatically identify different devices/partitions and handles them accordingly? I know partitions have something unique called a UUID and that this can somehow be used to automatically detect and discern pluggable devices, but I haven't found any "beginner's tutorial" on how to use that feature. > The main advantage of using LUKS is, AFAIK, that it allows you to change > your passphrase without having to re-encrypt all your data (while still > being "safe"). I do not know cryptmount well enough to compare it in > detail to cryptsetup; from the package description I get the feeling > that cryptmount has very similar features, except for LUKS support. > (Maybe it has another mechanism to achieve the same thing, though.) Well, the data on the disk is encrypted using a non-changing key which is generated once by a random generator. This key, in turn, is scrambled with your passphrase, so you can indeed change the passphrase by re-encrypting just the key. I'm sure LUKS uses a similar method because otherwise it would indeed have to re-encrypt the entire disk. Does LUKS or the USB automount system have any "hooks" into which I can plug stuff I want to be automatically executed upon mounting a device? That would be neat because that's where I'd put the "renice" kludge. --D.
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