Encryption of Workstations at ISIMA and LIMOS

• The CNRS, UCA, and the ANSSI mandate the encryption of all user workstations, whether fixed or portable.

• The encryption of your workstation(s) must be performed through the CRI ISIMA/LIMOS service:

  • A procedure exists for each operating system
  • Your recovery key to decrypt the disk in case of an incident will be stored in a secure vault

• Your external drives / USB keys must also be encrypted with VeraCrypt by you or by contacting the CRI ISIMA/LIMOS service

Backup Policy

• To avoid unpleasant surprises, always ensure that:

  • Your workstation data is automatically backed up by the CRI ISIMA/LIMOS

  • Your data is stored in locations "recommended" by UCA:

    • https://mail.uca.fr for emails
    • https://drive.uca.fr for personal/professional files
    • https://drive.mesocentre.uca.fr/ for large research files

  • Your data is stored in locations "recommended" by ISIMA:

    • https://owncloud.isima.fr
    • https://owncloud.limos.fr

Adding an Additional Linux Encryption Key

First, determine which partition is encrypted, then find a free slot to add a new key, and finally add your key.

This new key, along with any existing one, will allow you to decrypt the computer.

• lsblk to identify the encrypted partition
  • Here, we see that sda3 is encrypted
• sudo cryptsetup luksDump /dev/sda3 to view which slots are used for encryption (and which are free)
• 
  • We see that slot 0 is used by the key set during installation
  • The other 7 slots are free
• sudo cryptsetup luksAddKey --key-slot 1 /dev/sda3 to add a key to slot 1 (which is free) on partition sda3
  • You will then be prompted for a new passphrase

Modifying the Key (PIN Code) for Windows

On Windows 10, BitLocker manages encryption.

A recovery key has already been created and saved, and a 10-digit PIN code has been added.

This PIN is what allows you to decrypt the machine, and it can be modified.

• Type BitLocker in the search bar (bottom left) and click on Manage BitLocker

• Enter a new 10-digit PIN code