diff --git a/test/e2e/12_sync.bats b/test/e2e/12_sync.bats
index f276f33485..f60041f37d 100644
--- a/test/e2e/12_sync.bats
+++ b/test/e2e/12_sync.bats
@@ -48,7 +48,6 @@ function setup() {
 function teardown() {
   # Teardown the created port-forward to gitsrv and restore Git settings.
   kill "$git_port_forward_pid"
-  unset GIT_SSH_COMMAND
   # Uninstall Flux and the global resources it installs.
   uninstall_flux_with_fluxctl
   # Removing the namespace also takes care of removing gitsrv.
diff --git a/test/e2e/20_commit_signing.bats b/test/e2e/20_commit_signing.bats
index 783a0c9124..7af9891577 100644
--- a/test/e2e/20_commit_signing.bats
+++ b/test/e2e/20_commit_signing.bats
@@ -6,6 +6,7 @@ load lib/gpg
 load lib/install
 load lib/poll
 
+tmp_gnupghome=""
 git_port_forward_pid=""
 
 function setup() {
@@ -22,7 +23,6 @@ function setup() {
   # Create a temporary GNUPGHOME
   tmp_gnupghome=$(mktemp -d)
   export GNUPGHOME="$tmp_gnupghome"
-  defer rm -rf "$tmp_gnupghome"
 
   # Install Flux, with a new GPG key and signing enabled
   gpg_key=$(create_gpg_key)
@@ -68,7 +68,9 @@ function setup() {
 function teardown() {
   # Teardown the created port-forward to gitsrv and restore Git settings.
   kill "$git_port_forward_pid"
-  unset GIT_SSH_COMMAND
+  # Kill the agent and remove temporary GNUPGHOME
+  gpgconf --kill gpg-agent
+  rm -rf "$tmp_gnupghome"
   # Uninstall Flux and the global resources it installs.
   uninstall_flux_gpg
   # Removing the namespace also takes care of removing Flux and gitsrv.
diff --git a/test/e2e/20_commit_verification.bats b/test/e2e/20_commit_verification.bats
new file mode 100644
index 0000000000..4213964de8
--- /dev/null
+++ b/test/e2e/20_commit_verification.bats
@@ -0,0 +1,106 @@
+#!/usr/bin/env bats
+
+load lib/defer
+load lib/env
+load lib/gpg
+load lib/install
+load lib/poll
+
+tmp_gnupghome=""
+
+function setup() {
+  kubectl create namespace "${FLUX_NAMESPACE}"
+
+  # Create a temporary GNUPGHOME
+  tmp_gnupghome=$(mktemp -d)
+  export GNUPGHOME="$tmp_gnupghome"
+}
+
+@test "Commits are verified" {
+  # Create a new GPG key and secret
+  gpg_key=$(create_gpg_key)
+  create_secret_from_gpg_key "$gpg_key"
+
+  # Install the git server with signed init commit,
+  # allowing external access
+  install_git_srv flux-git-deploy git_srv_result true
+
+  # Install Flux with the GPG key, and commit verification enabled
+  install_flux_gpg "$gpg_key" true
+
+  # shellcheck disable=SC2154
+  git_ssh_cmd="${git_srv_result[0]}"
+  export GIT_SSH_COMMAND="$git_ssh_cmd"
+
+  git_port_forward_pid="${git_srv_result[1]}"
+  defer kill "$git_port_forward_pid"
+
+  # Test that the resources from https://github.com/fluxcd/flux-get-started are deployed
+  poll_until_true 'namespace demo' 'kubectl describe ns/demo'
+  defer kubectl delete namespace "$DEMO_NAMESPACE"
+
+  # Clone the repo
+  local clone_dir
+  clone_dir="$(mktemp -d)"
+  defer rm -rf "$clone_dir"
+  git clone -b master ssh://git@localhost/git-server/repos/cluster.git "$clone_dir"
+  cd "$clone_dir"
+
+  local sync_tag="flux-sync"
+  local org_head_hash
+  org_head_hash=$(git rev-list -n 1 HEAD)
+  sync_tag_hash=$(git rev-list -n 1 "$sync_tag")
+
+  [ "$sync_tag_hash" = "$org_head_hash" ]
+  run git verify-commit "$sync_tag_hash"
+  [ "$status" -eq 0 ]
+
+  # Add an unsigned change
+  sed -i'.bak' 's%stefanprodan/podinfo:*%stefanprodan/podinfo:3.1.5)%' "${clone_dir}/workloads/podinfo-dep.yaml"
+  git -c 'user.email=foo@bar.com' -c 'user.name=Foo' commit -am "Bump podinfo"
+  git push
+
+  # Delete tag
+  git push --delete origin "$sync_tag"
+
+  # Sync should warn, and put the tag back at the latest verified commit
+  run fluxctl --k8s-fwd-ns "${FLUX_NAMESPACE}" sync
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Warning: The branch HEAD in the git repo is not verified"* ]]
+
+  git pull -f --tags
+  sync_tag_hash=$(git rev-list -n 1 "$sync_tag")
+  [ "$sync_tag_hash" = "$org_head_hash" ]
+}
+
+@test "Does not commit on top of invalid commit" {
+  # Create a new GPG key and secret
+  gpg_key=$(create_gpg_key)
+  create_secret_from_gpg_key "$gpg_key"
+
+  # Install the git server with _unsigned_ init commit,
+  # allowing external access
+  install_git_srv flux-git-deploy git_srv_result false
+
+  # Install Flux with the GPG key, and commit verification enabled
+  install_flux_gpg "$gpg_key" true
+
+  # Wait for Flux to report that it sees an invalid commit
+  poll_until_true 'invalid GPG signature log' "kubectl logs -n ${FLUX_NAMESPACE} deploy/flux-gpg | grep -e 'found invalid GPG signature for commit'"
+
+  # Attempt to lock a resource, and confirm it returns an error.
+  run fluxctl --k8s-fwd-ns "${FLUX_NAMESPACE}" lock --workload demo:deployment/podinfo
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"Error: HEAD revision is unsigned"* ]]
+}
+
+function teardown() {
+  # Kill the agent and remove temporary GNUPGHOME
+  gpgconf --kill gpg-agent
+  rm -rf "$tmp_gnupghome"
+  # Although the namespace delete below takes care of removing most Flux
+  # elements, the global resources will not be removed without this.
+  uninstall_flux_gpg
+  # Removing the namespace also takes care of removing Flux and gitsrv.
+  kubectl delete namespace "$FLUX_NAMESPACE"
+}
diff --git a/test/e2e/fixtures/gitsrv-gpg.yaml b/test/e2e/fixtures/gitsrv-gpg.yaml
new file mode 100644
index 0000000000..f75320a8f5
--- /dev/null
+++ b/test/e2e/fixtures/gitsrv-gpg.yaml
@@ -0,0 +1,63 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    name: gitsrv
+  name: gitsrv
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      name: gitsrv
+  template:
+    metadata:
+      labels:
+        name: gitsrv
+    spec:
+      containers:
+      - image: stefanprodan/gitsrv:0.1.0
+        name: git
+        env:
+        - name: REPO
+          value: "cluster.git"
+        - name: TAR_URL
+          value: "https://github.com/fluxcd/flux-get-started/archive/master.tar.gz"
+        - name: GPG_KEYFILE
+          value: /git-server/gpg/flux.asc
+        ports:
+        - containerPort: 22
+          name: ssh
+          protocol: TCP
+        volumeMounts:
+        - mountPath: /git-server/gpg
+          name: git-gpg-keys
+        - mountPath: /git-server/repos
+          name: git-server-data
+        - mountPath: /git-server/keys
+          name: flux-git-deploy
+      volumes:
+      - name: flux-git-deploy
+        secret:
+          secretName: $GIT_SECRET_NAME
+      - name: git-server-data
+        emptyDir: {}
+      - name: git-gpg-keys
+        secret:
+          secretName: $GPG_SECRET_NAME
+---
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    name: gitsrv
+  name: gitsrv
+spec:
+  ports:
+    - name: ssh
+      port: 22
+      protocol: TCP
+      targetPort: ssh
+  selector:
+    name: gitsrv
+  type: ClusterIP
diff --git a/test/e2e/fixtures/gitsrv.yaml b/test/e2e/fixtures/gitsrv.yaml
index eced1a1040..aed5ae3592 100644
--- a/test/e2e/fixtures/gitsrv.yaml
+++ b/test/e2e/fixtures/gitsrv.yaml
@@ -16,13 +16,15 @@ spec:
         name: gitsrv
     spec:
       containers:
-      - image: stefanprodan/gitsrv:0.0.12
+      - image: stefanprodan/gitsrv:0.1.0
         name: git
         env:
         - name: REPO
           value: "cluster.git"
         - name: TAR_URL
           value: "https://github.com/fluxcd/flux-get-started/archive/master.tar.gz"
+        - name: GPG_KEYFILE
+          value: ""
         ports:
         - containerPort: 22
           name: ssh
diff --git a/test/e2e/fixtures/known_hosts b/test/e2e/fixtures/known_hosts
index 27da08378c..dd575725ac 100644
--- a/test/e2e/fixtures/known_hosts
+++ b/test/e2e/fixtures/known_hosts
@@ -1,4 +1,4 @@
 # generated with "ssh-keyscan gitsrv"
-gitsrv ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC2WoJ2k+WA54pdxw5EGhg9CQBHKDVjHzNNlgRfTGrQBpgQT3/HEBi6BGi2ZmS6o6W9EJfzYzl3PvC+JY6BqcdM8XqbDazC1rkGtlycHd+dFT/TmWvBqJ2Oh+oJNL7IgpjBPJJMdAEc9nzUTTYa7V2A9SeaAyQJKGaftZhHEXTxkxxbWP2an7bzyw9QNCiF/ogQ79DPsp7ly4v4KgeGLSm9AoT/HO5+kJwXX3yQ1hKrFZyhzhaYiwzdApc3iUJtUEz1lKVX+63+WN6qhkbCUjlhfOGyT3qk18sMU6raqKt8uuQeR9f4/xkMXGWQuULhjGwOkju+8Dma8GvnhKKwHf5V
-gitsrv ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFhuyD3SzMaTye/OX51Jb3fgZDxhGnXgJQ6oFvSSwqDGDm4fcueHE979xEPolNe9hn6jGg/2DS3xkU8boPKv8mo=
-gitsrv ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAbLc9veRHa/l/kK6hmRWMA+QoWd8vLtLHbm4v6wj8XU
+gitsrv ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxSccSZ6jNybRRvuNl9Rv4+HNqZ93rPsjRZko5E2kFfd5BMSflISpRK5owVO+YmeggEY3n86hX4CB/dpxYL62ur9QtkYQICL2fmgc40eE6XshsFSuS44PXmv4IrcHkHaqXl7bjbDon8UHLlRPI2ZFPHnvxa1TEth9i0L14tT4NkTbUNQlyAubM1Jxkph64c21zVSbGlaeflTZFbr2+qi0VfC44pxOWy2WMeS+KbApPScQF7LSNhRDXG/mVylOkc4kZfe1N15WOjKGGJiawFCP7/IjbQBoPaPFIAqU++pJ/IuH/Rv5FAZuc+zH1Vw2UtEU3z9STR30DUdqLSW1oEgYr
+gitsrv ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBO0Frzlxfern1gNWgnbNK4jDLBcMSuueBuj3n/P2KbHIng5vZocuVlA60YaCwN7bLyWplG/kA8zMVeLI3+Vl5JU=
+gitsrv ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIT2f8tK1sXJBRlwyhUpam6dkQmiBxBnMJcKLE1xvap+
diff --git a/test/e2e/lib/install.bash b/test/e2e/lib/install.bash
index 1994eb68d0..4c0ac13f2e 100755
--- a/test/e2e/lib/install.bash
+++ b/test/e2e/lib/install.bash
@@ -83,7 +83,8 @@ flux_gpg_helm_template="helm template --name flux-gpg
 
 function install_flux_gpg() {
   local key_id=${1}
-  local gpg_secret_name=${2:-flux-gpg-signing-key}
+  local git_verify=${2:-false}
+  local gpg_secret_name=${3:-flux-gpg-signing-key}
 
   if [ -z "$key_id" ]; then
     echo "no key ID provided" >&2
@@ -95,6 +96,7 @@ function install_flux_gpg() {
     --set-string git.config.data="${GITCONFIG}" \
     --set-string ssh.known_hosts="${KNOWN_HOSTS}" \
     --set-string git.signingKey="$key_id" \
+    --set-string git.verifySignatures="$git_verify" \
     --set-string gpgKeys.secretName="$gpg_secret_name" \
     "${FLUX_ROOT_DIR}/chart/flux" |
     kubectl --namespace "${FLUX_NAMESPACE}" apply -f - >&3
@@ -110,22 +112,35 @@ function uninstall_flux_gpg() {
 }
 
 function install_git_srv() {
-  local secret_name=${1:-flux-git-deploy}
+  local git_secret_name=${1:-flux-git-deploy}
   local external_access_result_var=${2}
+  local gpg_enable=${3:-false}
+  local gpg_secret_name=${4:-flux-gpg-signing-key}
   local gen_dir
   gen_dir=$(mktemp -d)
 
   ssh-keygen -t rsa -N "" -f "$gen_dir/id_rsa"
   defer rm -rf "$gen_dir"
-  kubectl create secret generic "$secret_name" \
+  kubectl create secret generic "$git_secret_name" \
     --namespace="${FLUX_NAMESPACE}" \
     --from-file="${FIXTURES_DIR}/known_hosts" \
     --from-file="$gen_dir/id_rsa" \
     --from-file=identity="$gen_dir/id_rsa" \
     --from-file="$gen_dir/id_rsa.pub"
 
-  sed "s/\$GIT_SECRET_NAME/$secret_name/" < "${E2E_DIR}/fixtures/gitsrv.yaml" | kubectl apply -n "${FLUX_NAMESPACE}" -f -
-  # wait for the git server to be ready
+  local template="${E2E_DIR}/fixtures/gitsrv.yaml"
+  if [ "$gpg_enable" == "true" ]; then
+    template="${E2E_DIR}/fixtures/gitsrv-gpg.yaml"
+  fi
+
+  (
+    export GIT_SECRET_NAME=$git_secret_name
+    export GPG_SECRET_NAME=$gpg_secret_name
+
+    envsubst < "$template" | kubectl apply -n "${FLUX_NAMESPACE}" -f - >&3
+  )
+
+  # Wait for the git server to be ready
   kubectl -n "${FLUX_NAMESPACE}" rollout status deployment/gitsrv
 
   if [ -n "$external_access_result_var" ]; then