diff --git a/home/david/configurations/Tytonidae/default.nix b/home/david/configurations/Tytonidae/default.nix
index aff5beb..c83d3f9 100644
--- a/home/david/configurations/Tytonidae/default.nix
+++ b/home/david/configurations/Tytonidae/default.nix
@@ -17,7 +17,10 @@
     ./zed.nix
   ];
 
-  youthlic.programs.helix.enable = true;
+  youthlic.programs = {
+    helix.enable = true;
+    gpg.enable = true;
+  };
 
   xdg.userDirs = {
     enable = true;
diff --git a/home/david/configurations/Tytonidae/fish/default.nix b/home/david/configurations/Tytonidae/fish/default.nix
index 9729c46..5538972 100644
--- a/home/david/configurations/Tytonidae/fish/default.nix
+++ b/home/david/configurations/Tytonidae/fish/default.nix
@@ -48,4 +48,7 @@
       nix-direnv.enable = true;
     };
   };
+  services = {
+    gpg-agent.enableFishIntegration = true;
+  };
 }
diff --git a/home/modules/default.nix b/home/modules/default.nix
index 9a8a2c7..8db7e5a 100644
--- a/home/modules/default.nix
+++ b/home/modules/default.nix
@@ -7,6 +7,7 @@
     ++ [
       ./nix.nix
       ./helix
+      ./gpg
     ];
 
   options = {
diff --git a/home/modules/gpg/default.nix b/home/modules/gpg/default.nix
new file mode 100644
index 0000000..25a0989
--- /dev/null
+++ b/home/modules/gpg/default.nix
@@ -0,0 +1,36 @@
+{ config, lib, ... }:
+{
+  options = {
+    youthlic.programs.gpg = {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        example = false;
+        description = ''
+          whether enable gpg
+        '';
+      };
+    };
+  };
+  config =
+    let
+      cfg = config.youthlic.programs.gpg;
+    in
+    lib.mkIf cfg.enable {
+      services.gpg-agent = {
+        enable = true;
+        enableSshSupport = true;
+      };
+      programs.gpg = {
+        enable = true;
+        mutableKeys = true;
+        mutableTrust = true;
+        publicKeys = [
+          {
+            source = ./public-key.txt;
+            trust = "ultimate";
+          }
+        ];
+      };
+    };
+}
diff --git a/home/modules/gpg/public-key.txt b/home/modules/gpg/public-key.txt
new file mode 100644
index 0000000..be8175e
--- /dev/null
+++ b/home/modules/gpg/public-key.txt
@@ -0,0 +1,23 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+AQCRDLL8wMjSlwONCLmERl8KoXnQhaEz/f3TiInUYbdkCw==
+=Rq0o
+-----END PGP PUBLIC KEY BLOCK-----