[kwlug-disc] Encrypted disk vs Encrypted Home

[Benjamin Tompkins]

What cipher though?

https://unix.stackexchange.com/questions/260533/how-do-can-i-tell-what-encryption-is-being-used-with-signed-in-luks

There are a couple of commands here that can help determine that.



On Thu, Apr 23, 2020 at 9:16 PM Ron Singh <ronsingh149 at gmail.com> wrote:

> dm-crypt and LUKS, and I have the Intel i7-2640M SandyBridge CPU with AES
> built-in, but I have no idea(yet) if dm-crypt uses any sort of built-in CPU
> encryption schemes.
>
> *Perhaps I should keep a piece of balsa wood(nice and light) in my
> knapsack as a lap platform and be done with it.*
>
> Thanks,
>
> Ron S.
>
>
>
> On Thu, Apr 23, 2020 at 8:17 PM Benjamin Tompkins <bjtompkins at gmail.com>
> wrote:
>
>> Do you know what cipher is being used, and is that cipher built into the
>> CPU?
>>
>> You may need to back up the data and re-encrypt the drive with a cipher
>> that the CPU  can do in hardware and not rely on it performing the
>> calculations in software.
>>
>> On Thu, Apr 23, 2020 at 7:16 PM Ron Singh <ronsingh149 at gmail.com> wrote:
>>
>>> I use laptops exclusively, I use Linux Mint all day long for my various
>>> jobs. I have a fleet of older Thinkpads I use for each biz/client.
>>>
>>> I grow more fearful of having my laptop du jour stolen.
>>>
>>> I have 3 identical laptops set up with Mint 18.2(based on Ubu 16.04 LTS)
>>> with the same power profile(using TLP).
>>> One has no encryption, 1 has encryption only on Home, the last has the
>>> entire SSD encrypted.
>>> - No encryption, idle temp is 39-40C (no issues on lap)
>>> - Encrypted Home,  idle temp is 42-45C (warm on lap but not
>>> uncomfortable)
>>> - Encrypted Disk, idle temp is 46-50C (uncomfortable as hell on lap)
>>>
>>> Any ideas on how to get that Encryted Disk temps down? I have the CPU
>>> locked down at 1.2Ghz max(from 2.6Ghz), unused ports go to sleep, running
>>> an SSD, fan is set  for aggressive blowing to reduce internal chassis temp.
>>>
>>> Thanks,
>>>
>>> Ron S.
>>>
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>>> kwlug-disc at kwlug.org
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>>>
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