diff --git a/.vscode/upgrade.sh b/.vscode/upgrade.sh
index c09dcf2..f3ecb90 100755
--- a/.vscode/upgrade.sh
+++ b/.vscode/upgrade.sh
@@ -15,8 +15,8 @@ trap 'handle_error "$BASH_COMMAND"' ERR
 nix flake update
 
 # update systems
-sudo nixos-rebuild switch -L --flake .#neodymium
-nixos-rebuild switch -L --flake .#hydrogen --target-host hydrogen
+sudo nixos-rebuild switch -L --flake .#silicium
+nixos-rebuild switch -L --flake .#cesium --target-host cesium
 
 # commit and push lock file
 git add flake.lock
diff --git a/flake.nix b/flake.nix
index c258b7d..e5aef7d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,10 +1,9 @@
 {
   description = "Laureηt's infrastructure";
 
-  # TODO: rekey les secrets + changer la key de hydrogen
-  # TODO: luks encrypt hydrogen (dropbear ?)
-  # TODO: dégager btfrs de neodymium, ext4 ftw
-  # TODO: setup disko sur neodymium
+  # TODO: rekey les secrets + changer la key de cesium
+  # TODO: luks encrypt cesium (dropbear ?)
+  # TODO: setup disko sur silicium
 
   inputs = {
     # core stuff
@@ -77,7 +76,7 @@
       flake = false;
     };
 
-    # hydrogen nginx sites
+    # cesium nginx sites
     resume = {
       url = "git+https://git.fainsin.bzh/Laurent/resume";
       inputs.nixpkgs.follows = "nixpkgs";
diff --git a/home/shell/git.nix b/home/shell/git.nix
index cd399ab..6d931e9 100644
--- a/home/shell/git.nix
+++ b/home/shell/git.nix
@@ -6,7 +6,7 @@
     userEmail = "laurent@fainsin.bzh";
     signing = {
       signByDefault = true;
-      key = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINTvwXCT99s1EwOCeGQ28jyCAH/RBoLZza9k5I7wWdEu laurent@neodymium";
+      key = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINTvwXCT99s1EwOCeGQ28jyCAH/RBoLZza9k5I7wWdEu laurent@silicium";
     };
   };
 }
diff --git a/hosts/hydrogen/default.nix b/hosts/cesium/default.nix
similarity index 100%
rename from hosts/hydrogen/default.nix
rename to hosts/cesium/default.nix
diff --git a/hosts/hydrogen/services/acme/default.nix b/hosts/cesium/services/acme/default.nix
similarity index 100%
rename from hosts/hydrogen/services/acme/default.nix
rename to hosts/cesium/services/acme/default.nix
diff --git a/hosts/hydrogen/services/atuin/default.nix b/hosts/cesium/services/atuin/default.nix
similarity index 100%
rename from hosts/hydrogen/services/atuin/default.nix
rename to hosts/cesium/services/atuin/default.nix
diff --git a/hosts/hydrogen/services/default.nix b/hosts/cesium/services/default.nix
similarity index 100%
rename from hosts/hydrogen/services/default.nix
rename to hosts/cesium/services/default.nix
diff --git a/hosts/hydrogen/services/gitea/default.nix b/hosts/cesium/services/gitea/default.nix
similarity index 100%
rename from hosts/hydrogen/services/gitea/default.nix
rename to hosts/cesium/services/gitea/default.nix
diff --git a/hosts/hydrogen/services/nginx/default.nix b/hosts/cesium/services/nginx/default.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/default.nix
rename to hosts/cesium/services/nginx/default.nix
diff --git a/hosts/hydrogen/services/nginx/laurent/default.nix b/hosts/cesium/services/nginx/laurent/default.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/laurent/default.nix
rename to hosts/cesium/services/nginx/laurent/default.nix
diff --git a/hosts/hydrogen/services/nginx/laurent/resume.nix b/hosts/cesium/services/nginx/laurent/resume.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/laurent/resume.nix
rename to hosts/cesium/services/nginx/laurent/resume.nix
diff --git a/hosts/hydrogen/services/nginx/laurent/website.nix b/hosts/cesium/services/nginx/laurent/website.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/laurent/website.nix
rename to hosts/cesium/services/nginx/laurent/website.nix
diff --git a/hosts/hydrogen/services/nginx/n7/TP-calcul-parallele.nix b/hosts/cesium/services/nginx/n7/TP-calcul-parallele.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/TP-calcul-parallele.nix
rename to hosts/cesium/services/nginx/n7/TP-calcul-parallele.nix
diff --git a/hosts/hydrogen/services/nginx/n7/TP-reinforcement-learning.nix b/hosts/cesium/services/nginx/n7/TP-reinforcement-learning.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/TP-reinforcement-learning.nix
rename to hosts/cesium/services/nginx/n7/TP-reinforcement-learning.nix
diff --git a/hosts/hydrogen/services/nginx/n7/TP-traitement-audio-visuel.nix b/hosts/cesium/services/nginx/n7/TP-traitement-audio-visuel.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/TP-traitement-audio-visuel.nix
rename to hosts/cesium/services/nginx/n7/TP-traitement-audio-visuel.nix
diff --git a/hosts/hydrogen/services/nginx/n7/default.nix b/hosts/cesium/services/nginx/n7/default.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/default.nix
rename to hosts/cesium/services/nginx/n7/default.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-audionumerique.nix b/hosts/cesium/services/nginx/n7/projet-audionumerique.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-audionumerique.nix
rename to hosts/cesium/services/nginx/n7/projet-audionumerique.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-fin-etude.nix b/hosts/cesium/services/nginx/n7/projet-fin-etude.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-fin-etude.nix
rename to hosts/cesium/services/nginx/n7/projet-fin-etude.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-intelligence-artificielle-multimedia.nix b/hosts/cesium/services/nginx/n7/projet-intelligence-artificielle-multimedia.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-intelligence-artificielle-multimedia.nix
rename to hosts/cesium/services/nginx/n7/projet-intelligence-artificielle-multimedia.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-long.nix b/hosts/cesium/services/nginx/n7/projet-long.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-long.nix
rename to hosts/cesium/services/nginx/n7/projet-long.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-modelisation-geometrique.nix b/hosts/cesium/services/nginx/n7/projet-modelisation-geometrique.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-modelisation-geometrique.nix
rename to hosts/cesium/services/nginx/n7/projet-modelisation-geometrique.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-oral-anglais.nix b/hosts/cesium/services/nginx/n7/projet-oral-anglais.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-oral-anglais.nix
rename to hosts/cesium/services/nginx/n7/projet-oral-anglais.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-oral-japonais.nix b/hosts/cesium/services/nginx/n7/projet-oral-japonais.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-oral-japonais.nix
rename to hosts/cesium/services/nginx/n7/projet-oral-japonais.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-probleme-inverse-3D.nix b/hosts/cesium/services/nginx/n7/projet-probleme-inverse-3D.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-probleme-inverse-3D.nix
rename to hosts/cesium/services/nginx/n7/projet-probleme-inverse-3D.nix
diff --git a/hosts/hydrogen/services/nginx/n7/projet-systemes-algorithmes-repartis.nix b/hosts/cesium/services/nginx/n7/projet-systemes-algorithmes-repartis.nix
similarity index 100%
rename from hosts/hydrogen/services/nginx/n7/projet-systemes-algorithmes-repartis.nix
rename to hosts/cesium/services/nginx/n7/projet-systemes-algorithmes-repartis.nix
diff --git a/hosts/hydrogen/services/ssh/default.nix b/hosts/cesium/services/ssh/default.nix
similarity index 100%
rename from hosts/hydrogen/services/ssh/default.nix
rename to hosts/cesium/services/ssh/default.nix
diff --git a/hosts/hydrogen/system/boot/default.nix b/hosts/cesium/system/boot/default.nix
similarity index 100%
rename from hosts/hydrogen/system/boot/default.nix
rename to hosts/cesium/system/boot/default.nix
diff --git a/hosts/hydrogen/system/default.nix b/hosts/cesium/system/default.nix
similarity index 100%
rename from hosts/hydrogen/system/default.nix
rename to hosts/cesium/system/default.nix
diff --git a/hosts/hydrogen/system/disko/default.nix b/hosts/cesium/system/disko/default.nix
similarity index 100%
rename from hosts/hydrogen/system/disko/default.nix
rename to hosts/cesium/system/disko/default.nix
diff --git a/hosts/hydrogen/system/networking/default.nix b/hosts/cesium/system/networking/default.nix
similarity index 92%
rename from hosts/hydrogen/system/networking/default.nix
rename to hosts/cesium/system/networking/default.nix
index 596de77..19bb319 100644
--- a/hosts/hydrogen/system/networking/default.nix
+++ b/hosts/cesium/system/networking/default.nix
@@ -1,7 +1,7 @@
 {...}: {
   networking = {
     # the name of the machine
-    hostName = "hydrogen";
+    hostName = "cesium";
 
     # the domain used for the machine
     domain = "fainsin.bzh";
diff --git a/hosts/hydrogen/system/nix/default.nix b/hosts/cesium/system/nix/default.nix
similarity index 100%
rename from hosts/hydrogen/system/nix/default.nix
rename to hosts/cesium/system/nix/default.nix
diff --git a/hosts/hydrogen/system/packages/default.nix b/hosts/cesium/system/packages/default.nix
similarity index 100%
rename from hosts/hydrogen/system/packages/default.nix
rename to hosts/cesium/system/packages/default.nix
diff --git a/hosts/hydrogen/system/users/default.nix b/hosts/cesium/system/users/default.nix
similarity index 100%
rename from hosts/hydrogen/system/users/default.nix
rename to hosts/cesium/system/users/default.nix
diff --git a/hosts/default.nix b/hosts/default.nix
index d493d9a..f95f5a7 100644
--- a/hosts/default.nix
+++ b/hosts/default.nix
@@ -9,14 +9,19 @@
     users.laurent = ../home;
   };
 in {
-  # neodymium laptop
-  neodymium = nixpkgs.lib.nixosSystem {
+  # naming convention based on the periodic table
+  # NAS would be neodymium
+  # desktop would be neon
+  # smartphone would be lithium
+
+  # personal laptop
+  silicium = nixpkgs.lib.nixosSystem {
     system = "x86_64-linux";
     specialArgs = {
       inherit inputs;
     };
     modules = [
-      ./neodymium
+      ./silicium
       inputs.home-manager.nixosModules.home-manager
       inputs.agenix.nixosModules.default
       inputs.lanzaboote.nixosModules.lanzaboote
@@ -28,15 +33,34 @@ in {
     ];
   };
 
-  # hydrogen vps
-  hydrogen = nixpkgs.lib.nixosSystem rec {
+  # # work laptop
+  # aurum = nixpkgs.lib.nixosSystem {
+  #   system = "x86_64-linux";
+  #   specialArgs = {
+  #     inherit inputs;
+  #   };
+  #   modules = [
+  #     ./aurum
+  #     inputs.home-manager.nixosModules.home-manager
+  #     inputs.agenix.nixosModules.default
+  #     # inputs.lanzaboote.nixosModules.lanzaboote
+  #     # inputs.nixos-hardware.nixosModules.common-cpu-amd
+  #     # inputs.nixos-hardware.nixosModules.common-gpu-nvidia-disable
+  #     # inputs.nixos-hardware.nixosModules.common-pc-laptop
+  #     # inputs.nixos-hardware.nixosModules.common-pc-laptop-ssd
+  #     {inherit home-manager;}
+  #   ];
+  # };
+
+  # vps
+  cesium = nixpkgs.lib.nixosSystem rec {
     system = "x86_64-linux";
     specialArgs = {
       inherit inputs;
       inherit system;
     };
     modules = [
-      ./hydrogen
+      ./cesium
       inputs.home-manager.nixosModules.home-manager
       inputs.disko.nixosModules.default
       inputs.agenix.nixosModules.default
diff --git a/hosts/neodymium/default.nix b/hosts/silicon/default.nix
similarity index 100%
rename from hosts/neodymium/default.nix
rename to hosts/silicon/default.nix
diff --git a/hosts/neodymium/services/borgbackup/default.nix b/hosts/silicon/services/borgbackup/default.nix
similarity index 100%
rename from hosts/neodymium/services/borgbackup/default.nix
rename to hosts/silicon/services/borgbackup/default.nix
diff --git a/hosts/neodymium/services/default.nix b/hosts/silicon/services/default.nix
similarity index 100%
rename from hosts/neodymium/services/default.nix
rename to hosts/silicon/services/default.nix
diff --git a/hosts/neodymium/services/greetd/default.nix b/hosts/silicon/services/greetd/default.nix
similarity index 100%
rename from hosts/neodymium/services/greetd/default.nix
rename to hosts/silicon/services/greetd/default.nix
diff --git a/hosts/neodymium/system/adb/default.nix b/hosts/silicon/system/adb/default.nix
similarity index 100%
rename from hosts/neodymium/system/adb/default.nix
rename to hosts/silicon/system/adb/default.nix
diff --git a/hosts/neodymium/system/age/default.nix b/hosts/silicon/system/age/default.nix
similarity index 100%
rename from hosts/neodymium/system/age/default.nix
rename to hosts/silicon/system/age/default.nix
diff --git a/hosts/neodymium/system/audio/default.nix b/hosts/silicon/system/audio/default.nix
similarity index 100%
rename from hosts/neodymium/system/audio/default.nix
rename to hosts/silicon/system/audio/default.nix
diff --git a/hosts/neodymium/system/boot/default.nix b/hosts/silicon/system/boot/default.nix
similarity index 100%
rename from hosts/neodymium/system/boot/default.nix
rename to hosts/silicon/system/boot/default.nix
diff --git a/hosts/neodymium/system/boot/lanzaboot.nix b/hosts/silicon/system/boot/lanzaboot.nix
similarity index 100%
rename from hosts/neodymium/system/boot/lanzaboot.nix
rename to hosts/silicon/system/boot/lanzaboot.nix
diff --git a/hosts/neodymium/system/default.nix b/hosts/silicon/system/default.nix
similarity index 100%
rename from hosts/neodymium/system/default.nix
rename to hosts/silicon/system/default.nix
diff --git a/hosts/neodymium/system/docker/default.nix b/hosts/silicon/system/docker/default.nix
similarity index 100%
rename from hosts/neodymium/system/docker/default.nix
rename to hosts/silicon/system/docker/default.nix
diff --git a/hosts/neodymium/system/fonts/default.nix b/hosts/silicon/system/fonts/default.nix
similarity index 100%
rename from hosts/neodymium/system/fonts/default.nix
rename to hosts/silicon/system/fonts/default.nix
diff --git a/hosts/neodymium/system/hardware/default.nix b/hosts/silicon/system/hardware/default.nix
similarity index 100%
rename from hosts/neodymium/system/hardware/default.nix
rename to hosts/silicon/system/hardware/default.nix
diff --git a/hosts/neodymium/system/hardware/partitions.nix b/hosts/silicon/system/hardware/partitions.nix
similarity index 100%
rename from hosts/neodymium/system/hardware/partitions.nix
rename to hosts/silicon/system/hardware/partitions.nix
diff --git a/hosts/neodymium/system/i18n/default.nix b/hosts/silicon/system/i18n/default.nix
similarity index 100%
rename from hosts/neodymium/system/i18n/default.nix
rename to hosts/silicon/system/i18n/default.nix
diff --git a/hosts/neodymium/system/networking/default.nix b/hosts/silicon/system/networking/default.nix
similarity index 92%
rename from hosts/neodymium/system/networking/default.nix
rename to hosts/silicon/system/networking/default.nix
index 669bcb7..2b7873e 100644
--- a/hosts/neodymium/system/networking/default.nix
+++ b/hosts/silicon/system/networking/default.nix
@@ -1,7 +1,7 @@
 {...}: {
   networking = {
     # the name of the machine
-    hostName = "neodymium";
+    hostName = "silicium";
 
     # domain name servers, use clouflare family
     nameservers = ["1.1.1.2" "1.0.0.2"];
diff --git a/hosts/neodymium/system/nix/default.nix b/hosts/silicon/system/nix/default.nix
similarity index 100%
rename from hosts/neodymium/system/nix/default.nix
rename to hosts/silicon/system/nix/default.nix
diff --git a/hosts/neodymium/system/security/default.nix b/hosts/silicon/system/security/default.nix
similarity index 100%
rename from hosts/neodymium/system/security/default.nix
rename to hosts/silicon/system/security/default.nix
diff --git a/hosts/neodymium/system/users/default.nix b/hosts/silicon/system/users/default.nix
similarity index 100%
rename from hosts/neodymium/system/users/default.nix
rename to hosts/silicon/system/users/default.nix
diff --git a/secrets/secrets.nix b/secrets/secrets.nix
index 52a3227..ff7bfd1 100644
--- a/secrets/secrets.nix
+++ b/secrets/secrets.nix
@@ -1,7 +1,7 @@
 let
-  neodymium = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINTvwXCT99s1EwOCeGQ28jyCAH/RBoLZza9k5I7wWdEu laurent@neodymium";
-  hydrogen = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAxh42mMYqftTU7WtfktZbkdMI07VuH7mhUv3m2Ca3fV root@hydrogen";
+  silicium = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINTvwXCT99s1EwOCeGQ28jyCAH/RBoLZza9k5I7wWdEu laurent@silicium";
+  cesium = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAxh42mMYqftTU7WtfktZbkdMI07VuH7mhUv3m2Ca3fV root@cesium";
 in {
-  "borgbackup.age".publicKeys = [neodymium];
-  "gitea.age".publicKeys = [neodymium hydrogen];
+  "borgbackup.age".publicKeys = [silicium];
+  "gitea.age".publicKeys = [silicium cesium];
 }