diff --git a/dotfiles/git/.gitconfig b/dotfiles/git/.gitconfig
index f921b96..5747d45 100644
--- a/dotfiles/git/.gitconfig
+++ b/dotfiles/git/.gitconfig
@@ -1,6 +1,9 @@
 [user]
         name = Ray Miller
         email = ray@1729.org.uk
+        signingkey = 2E19CF8255B6A04D55501F2C043F786C4CD681B8
+[commit]
+        gpgsign = true
 [core]
         excludesfile = /home/ray/.gitignore_global
 [filter "lfs"]
diff --git a/dotfiles/gnupg/.gnupg/gpg.conf b/dotfiles/gnupg/.gnupg/gpg.conf
new file mode 100644
index 0000000..c5ebad5
--- /dev/null
+++ b/dotfiles/gnupg/.gnupg/gpg.conf
@@ -0,0 +1 @@
+digest-algo sha512
diff --git a/home-configuration.scm b/home-configuration.scm
index ac171ef..a918564 100644
--- a/home-configuration.scm
+++ b/home-configuration.scm
@@ -75,5 +75,8 @@
                  (home-dotfiles-configuration
                   (directories '("./dotfiles"))
                   (layout 'stow)))
-        (service home-gpg-agent-service-type)
+        (service home-gpg-agent-service-type
+                 (home-gpg-agent-configuration
+                  (default-cache-ttl 7200)
+                  (max-cache-ttl 14400)))
         (service home-shepherd-service-type))))