Evaggelos Balaskas - System Engineer

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How to add password on your grub menu »
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« Suspending On Lid Close
Sep
14
2010
Encrypt your hibernation snapshot
Posted by ebal at 17:58:31 in planet_ellak, planet_Sysadmin

When a linux box came from hibernation usually resume everything from the previous state.
That means that if someone just hit the power button on your system, in a few minutes he/she will have access to your linux partition and most certain to an already logged-in system !

In a previous post i wrote how to enable Lock Screen after hibernation, but lets face it. This isnt a secure way!

And if someone has access to your hard drive he/she can somehow retrieve your data from your hibernate snapshot.

An alternative and most secure way is to encrypt your hibernate snapshot and then access it through a pass phrase.

First of all, your have to create the key for the encryption process.
Just type: suspend-keygen and then choose the length of the key. I prefer 4096 bits.
After that, you should type a secure pass phrase. Finally choose the name of the key.

A full example:

$ suspend-keygen 

libgcrypt version: 1.4.6
Key bits (between 1024 and 4096 inclusive) [1024]: 4096

Generating 4096-bit RSA keys.  Please wait.
Testing the private key.  Please wait.

Passphrase please (must be non-empty): 
Confirm passphrase: 

File name [suspend.key]: 

Τransfer your suspend.key to /etc


mv suspend.key /etc/

Now you must edit the below two lines on: /etc/suspend.conf

encrypt = y
RSA key file = /etc/suspend.key

Thats it !

The next time you resume your system from hibernation, you have to write your pass phrase to resume your encrypted hibernate snapshot.

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