<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">I get this --</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">sudo cryptsetup luksDump /dev/sda5<br>LUKS header information for /dev/sda5<br><br>Version: 1<br>Cipher name: aes<br>Cipher mode: xts-plain64<br>Hash spec: sha256<br>Payload offset: 4096<br>MK bits: 512<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Thanks,<br><br>Ron S.<br><br></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020 at 9:18 PM Benjamin Tompkins <<a href="mailto:bjtompkins@gmail.com">bjtompkins@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>What cipher though?</div><div><br></div><div><a href="https://unix.stackexchange.com/questions/260533/how-do-can-i-tell-what-encryption-is-being-used-with-signed-in-luks" target="_blank">https://unix.stackexchange.com/questions/260533/how-do-can-i-tell-what-encryption-is-being-used-with-signed-in-luks</a></div><div><br></div><div>There are a couple of commands here that can help determine that.</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020 at 9:16 PM Ron Singh <<a href="mailto:ronsingh149@gmail.com" target="_blank">ronsingh149@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">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.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><i>Perhaps I should keep a piece of balsa wood(nice and light) in my knapsack as a lap platform and be done with it.</i><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"></div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div>Thanks,<br><br>Ron S.<br><br></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020 at 8:17 PM Benjamin Tompkins <<a href="mailto:bjtompkins@gmail.com" target="_blank">bjtompkins@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Do you know what cipher is being used, and is that cipher built into the CPU?<br></div><div><br></div><div>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.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 23, 2020 at 7:16 PM Ron Singh <<a href="mailto:ronsingh149@gmail.com" target="_blank">ronsingh149@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">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.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I grow more fearful of having my laptop du jour stolen.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I have 3 identical laptops set up with Mint 18.2(based on Ubu 16.04 LTS) with the same power profile(using TLP).</div><div class="gmail_default" style="font-family:tahoma,sans-serif">One has no encryption, 1 has encryption only on Home, the last has the entire SSD encrypted.</div><div class="gmail_default" style="font-family:tahoma,sans-serif">- No encryption, idle temp is 39-40C (no issues on lap)<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">- Encrypted Home, idle temp is 42-45C (warm on lap but not uncomfortable)<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">- Encrypted Disk, idle temp is 46-50C (uncomfortable as hell on lap)<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">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.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br clear="all"></div><div><div dir="ltr"><div dir="ltr"><div>Thanks,<br><br>Ron S<span class="gmail_default" style="font-family:tahoma,sans-serif">.</span><br><br></div></div></div></div></div>
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