[kwlug-disc] Encrypted disk vs Encrypted Home

[Ron Singh]

I get this --

sudo cryptsetup luksDump /dev/sda5
LUKS header information for /dev/sda5

Version:       1
Cipher name:   aes
Cipher mode:   xts-plain64
Hash spec:     sha256
Payload offset: 4096
MK bits:       512

Thanks,

Ron S.



On Thu, Apr 23, 2020 at 9:18 PM Benjamin Tompkins <bjtompkins at gmail.com>
wrote:

> 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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