When installing any Linux (for example, Ubuntu or Kali), the installer offers to install disk encryption.

How will encryption affect the speed of the system ?, Will Linux use more computer resources and will it be noticeable?

  • if there is an additional operation, then of course it will affect the speed of work. But modern processors support many out-of-the-box encryption primitives, so they shouldn’t sag much. - KoVadim

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To a greater extent, this will affect the start of the OS, because The data of the encrypted disk must be decrypted before reading. Personally, it didn’t cause any problems to me, however, there is a chance that they will encounter problems when restoring the system if something went wrong.

If you do not need to store large amounts of super secret content, you can limit yourself to encrypting the user's directory (if necessary)

Have not yet had to deal with experts who recommend encrypting the disk. If you want to hide something or restrict access, use more clever methods. For example LVM on several physical disks with additional buns

  • I have not had to deal with experts who recommend encrypting the disk - it’s enough just to read any report about landing for a repost and see it in the comment from a guest expert - etki

One way or another affects the performance of the disk subsystem, processor and memory consumption. How exactly it affects the selected encryption algorithm, its support at the hardware level, the selected encryption option: the defined partition is encrypted, the entire disk, several disks.