[dm-crypt] Questions on LUKS

Ruiz, Edwin eruiz03 at harris.com
Wed Sep 21 14:09:44 CEST 2016

To whom it may concern,

I will be implementing the use of dmcrypt-LUKS on a project I am work on, but I need explicit verbage of some features that I cannot find answers to.

1.       When LUKS is applied to a partition of a drive, is decrypted data only stored in memory and never written back to the drive (unencrypted).

2.       Is there any caching of decrypted data; If accessed again, is it read from memory or decrypted again?

3.       What are the implications of a system that is shut down (powerloss, critical failure, etc.) without the command "lucksClose" issued to an encrypted device?


Edwin Ruiz
Systems Administrator, VCS21
Critical Networks / HARRIS CORPORATION
Office: +1-321-308-7361
Cell: +1-910-587-9003
harris.com<http://www.harris.com/>  / eruiz03 at harris.com<mailto:eruiz03 at harris.com>
1025 W. Nasa Blvd. Melbourne, FL 32919

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