[kwlug-disc] Encrypted disk vs Encrypted Home

[Ron Singh]

Yeah, I think I am sunk, I will try seemingly silly things like turning off
HT and fixing the max cpu speed down to 800Mhz as I need very little cpu
speed for my work.  Big-big thanks for the help!

Ron S.



On Thu, Apr 23, 2020 at 9:33 PM Benjamin Tompkins <bjtompkins at gmail.com>
wrote:

> Ok.  So you are using AES as the cipher, so it should be using the CPU
> hardware capability already.
>
> I am not sure if you are going to be able get any more efficiency and a
> cooler CPU.
>
>
>
> On Thu, Apr 23, 2020 at 9:27 PM Ron Singh <ronsingh149 at gmail.com> wrote:
>
>> 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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>>>>>> https://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org
>>>>>>
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