diff --git a/.env.example b/.env.example
index bbb9617..476d3ad 100644
--- a/.env.example
+++ b/.env.example
@@ -1,5 +1,8 @@
 PARTY_1_PROJECT=pprl-party-1
+PARTY_1_KEY_VERSION=1
+
 PARTY_2_PROJECT=pprl-party-2
+PARTY_2_KEY_VERSION=1
 
 WORKLOAD_AUTHOR_PROJECT=pprl-party-1
 WORKLOAD_AUTHOR_PROJECT_REGION=europe-west2
diff --git a/scripts/06-tear-down-operator.sh b/scripts/06-tear-down-operator.sh
new file mode 100644
index 0000000..61e44f6
--- /dev/null
+++ b/scripts/06-tear-down-operator.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+#
+# Tears down all billable resources for the workload operator.
+
+echo "Loading functions and environment variables..."
+source common.sh
+
+set_gcp_project $WORKLOAD_OPERATOR_PROJECT
+
+echo "Deleting workload virtual machine..."
+gcloud compute instances delete \
+  projects/$WORKLOAD_OPERATOR_PROJECT/zones/$WORKLOAD_OPERATOR_PROJECT_ZONE/instances/pprl-cvm
+
+delete_storage_bucket $ATTESTATION_BUCKET
+
+delete_service_account $WORKLOAD_SERVICE_ACCOUNT_EMAIL
diff --git a/scripts/06-tear-down.sh b/scripts/06-tear-down.sh
deleted file mode 100644
index 2992bed..0000000
--- a/scripts/06-tear-down.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/bash
-set -e
-set -o pipefail
-
-# This script sets up the server architecture for linkage on GCP
-
-## Load in our environment variables
-echo "Loading environment variables..."
-export $(grep "^PROJECT" .env.admin | xargs -0)
-export PROJECT_PARTIES=($PROJECT_PARTY_1 $PROJECT_PARTY_2)
-export PROJECT_NUMBER=$(gcloud projects describe $PROJECT_NAME --format "value(projectNumber)")
-export SERVICE_DOMAIN=$PROJECT_NAME.iam.gserviceaccount.com
-export KEYRINGS_LOCATION=projects/$PROJECT_NAME/locations/$PROJECT_REGION/keyRings
-
-# Delete compute instance
-echo "Y" | gcloud compute instances delete projects/$PROJECT_NAME/zones/$PROJECT_REGION/instances/pprl-tee
-
-# (option) Delete docker repo and any images
-echo "Y" | gcloud artifacts repositories delete pprl-repo --location=$PROJECT_REGION
-
-# Delete service accounts
-
-# Delete keys
-
-# (option) Delete storage buckets
-
-
-# Delete workload identity pools and any attestation verifiers
diff --git a/scripts/07-tear-down-author.sh b/scripts/07-tear-down-author.sh
new file mode 100644
index 0000000..622263a
--- /dev/null
+++ b/scripts/07-tear-down-author.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+#
+# Tears down all billable resources for the workload author.
+
+echo "Loading functions and environment variables..."
+source common.sh
+
+set_gcp_project $WORKLOAD_AUTHOR_PROJECT
+
+delete_artifact_repository $ARTIFACT_REPOSITORY $WORKLOAD_AUTHOR_PROJECT_REGION
diff --git a/scripts/08-tear-down-party.sh b/scripts/08-tear-down-party.sh
new file mode 100644
index 0000000..7694d41
--- /dev/null
+++ b/scripts/08-tear-down-party.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Tears down all billable resources for the data-owning party.
+
+echo "Loading functions and environment variables..."
+source common.sh
+
+export PROJECT_NAME=${1}
+export PROJECT_KEY_VERSION=${2}
+if [ ! $PROJECT_KEY_VERSION ]; then
+do
+  export PROJECT_KEY_VERSION=1
+done
+
+set_gcp_project $PROJECT_NAME
+
+delete_storage_bucket $PROJECT_NAME-bucket
+
+destroy_kms_key_version \
+  $PROJECT_NAME-akek $PROJECT_NAME-akek-kr $PROJECT_LOCATION $PROJECT_KEY_VERSION
+
+delete_workload_identity_pool $PROJECT_NAME-wip $PROJECT_LOCATION
+
+delete_service_account $PROJECT_NAME-sa@$PROJECT_NAME.iam.gserviceaccount.com
diff --git a/scripts/common.sh b/scripts/common.sh
index 2b12235..0522ff9 100644
--- a/scripts/common.sh
+++ b/scripts/common.sh
@@ -152,18 +152,19 @@ create_kms_encryption_key() {
 #   Key name
 #   Keyring name
 #   Location
+#   Key version
 #######################################
-destroy_kms_key() {
+destroy_kms_key_version() {
   gcloud kms keys list --keyring=${2} --location=${3} --filter="PRIMARY_STATE=(ENABLED)" | grep ${1}
   if [[ $? -eq 0 ]]; then
-    gcloud kms keys versions destroy 1 --key ${1} --keyring ${2} --location ${3}
+    gcloud kms keys versions destroy ${4} --key ${1} --keyring ${2} --location ${3}
     if [[ $? -eq 0 ]]; then
-      echo "Key ${1} is deleted successfully."
+      echo "Key ${1} version ${4} deleted successfully."
     else
-      err "Failed to delete a key ${1}."
+      err "Failed to delete key ${1} version ${4}."
     fi
   else
-    echo "Key ${1} doesn't exist. Skipping the deletion of the key ${1}..."
+    echo "Key ${1} version ${4} doesn't exist. Skipping deletion..."
   fi
 }
 
diff --git a/scripts/server.py b/scripts/server.py
index 8424988..8a4416f 100644
--- a/scripts/server.py
+++ b/scripts/server.py
@@ -30,8 +30,10 @@ def load_environment_variables(path: None | str = None) -> tuple[str, str, str,
         Name of the second party.
     location : str
         Location of the workload identity pools and keyrings.
-    version : str
-        Version of the key encryption keys.
+    version_1 : str
+        Version of the key encryption key for the first party.
+    version_2 : str
+        Version of the key encryption key for the second party.
     """
 
     environ = config.load_environment(path)
@@ -40,9 +42,10 @@ def load_environment_variables(path: None | str = None) -> tuple[str, str, str,
     party_1 = environ.get("PARTY_1_PROJECT")
     party_2 = environ.get("PARTY_2_PROJECT")
     location = environ.get("PROJECT_LOCATION", "global")
-    version = environ.get("PROJECT_KEY_VERSION", 1)
+    version_1 = environ.get("PARTY_1_KEY_VERSION", 1)
+    version_2 = environ.get("PARTY_2_KEY_VERSION", 1)
 
-    return operator, party_1, party_2, location, version
+    return operator, party_1, party_2, location, version_1, version_2
 
 
 def main():
@@ -53,15 +56,17 @@ def main():
         logger.setup_logging()
         logging.info("Logging set up.")
 
-        operator, party_1, party_2, location, version = load_environment_variables(".env")
+        operator, party_1, party_2, location, version_1, version_2 = load_environment_variables(
+            ".env"
+        )
         parties = (party_1, party_2)
 
         logging.info("Downloading embedder...")
         embedder = cloud.download_embedder(parties, operator)
 
         logging.info("Preparing assets...")
-        data_1, dek_1 = cloud.prepare_party_assets(party_1, operator, location, version)
-        data_2, dek_2 = cloud.prepare_party_assets(party_2, operator, location, version)
+        data_1, dek_1 = prepare_party_assets(party_1, operator, location, version_1)
+        data_2, dek_2 = prepare_party_assets(party_2, operator, location, version_2)
 
         logging.info("Performing matching...")
         outputs = perform_matching(data_1, data_2, embedder)
@@ -74,12 +79,13 @@ def main():
     else:
         logging.basicConfig(encoding="utf-8", level=logging.INFO)
 
-        operator, party_1, party_2, location, version = load_environment_variables()
-        inpath_1, outpath_1 = local.build_local_file_paths(party_1)
-        inpath_2, outpath_2 = local.build_local_file_paths(party_2)
-        embedder = local.load_embedder()
+        logging.info("Setting up environment and file paths...")
+        operator, party_1, party_2, *_ = load_environment_variables()
+        inpath_1, outpath_1 = build_local_file_paths(party_1)
+        inpath_2, outpath_2 = build_local_file_paths(party_2)
 
         logging.info("Loading files...")
+        embedder = load_embedder()
         data_1 = pd.read_json(inpath_1)
         data_2 = pd.read_json(inpath_2)
 
diff --git a/src/pprl/app/__init__.py b/src/pprl/app/__init__.py
index 2db8696..0956eb1 100644
--- a/src/pprl/app/__init__.py
+++ b/src/pprl/app/__init__.py
@@ -29,6 +29,7 @@ def home():
     environ = config.load_environment()
     parties = (environ.get("PARTY_1_PROJECT"), environ.get("PARTY_2_PROJECT"))
     app.config["env"] = environ
+    app.config["parties"] = parties
 
     return flask.render_template("home.html", parties=parties)
 
@@ -109,11 +110,16 @@ def upload_to_gcp(data, embedder):
     """Encrypt and upload the data to GCP, then wait for results."""
 
     app.config["submission_time"] = datetime.now(timezone.utc)
-    party_config = app.config.get("config")
     party = app.config.get("party")
+    environ = app.config.get("env")
+
+    location = environ.get("PROJECT_LOCATION", "global")
+
+    party_num = next(i + 1 for i, part in enumerate(app.config["parties"]) if party == part)
+    version = environ.get(f"PARTY_{party_num}_KEY_VERSION", 1)
 
     data_encrypted, dek = encryption.encrypt_data(data)
-    dek_encrypted = encryption.encrypt_dek(dek, party, party_config)
+    dek_encrypted = encryption.encrypt_dek(dek, party, location, version)
     app.config["dek"] = dek
 
     store = app.config.get("store")
diff --git a/src/pprl/encryption.py b/src/pprl/encryption.py
index 223f322..d45c3f9 100644
--- a/src/pprl/encryption.py
+++ b/src/pprl/encryption.py
@@ -64,7 +64,7 @@ def decrypt_data(encrypted: bytes, key: bytes) -> pd.DataFrame:
 
 
 def _build_key_version_path(
-    party: str, location: str, version: int, client: kms.KeyManagementServiceClient
+    party: str, location: str, version: int | str, client: kms.KeyManagementServiceClient
 ) -> str:
     """
     Build a full key version path for retrieval from KMS.
@@ -75,7 +75,7 @@ def _build_key_version_path(
         Name of the party whose key to retrieve.
     location : str
         Location of the keyring on which the key lives.
-    version : int
+    version : int | str
         Version of the key to retrieve.
     client : google.cloud.kms.KeyManagementServiceClient
         Connection to KMS.
@@ -92,7 +92,7 @@ def _build_key_version_path(
     return path
 
 
-def _get_public_key(party: str, location: str, version: int, **kwargs: dict) -> bytes:
+def _get_public_key(party: str, location: str, version: int | str, **kwargs: dict) -> bytes:
     """
     Get the public key from the GCP Key Management Service (KMS).
 
@@ -102,7 +102,7 @@ def _get_public_key(party: str, location: str, version: int, **kwargs: dict) ->
         Name of the party.
     location : str
         Location of the keyring on which the key lives.
-    version : int
+    version : int | str
         Key version to use.
     **kwargs : dict
         Keyword arguments to pass when creating an instance of
@@ -123,7 +123,7 @@ def _get_public_key(party: str, location: str, version: int, **kwargs: dict) ->
 
 
 def encrypt_dek(
-    dek: bytes, party: str, location: str = "global", version: int = 1, **kwargs: dict
+    dek: bytes, party: str, location: str = "global", version: int | str = 1, **kwargs
 ) -> bytes:
     """
     Encrypt the data encryption key.
@@ -139,8 +139,8 @@ def encrypt_dek(
         Name of the party.
     location : str
         Location of the keyring on which the key lives.
-    version : int
-        Version of the assymetric key to get from GCP. Default is 1.
+    version : int | str
+        Version of the asymmetric key to get from GCP. Default is 1.
     **kwargs : dict
         Keyword arguments to pass when creating an instance of
         `google.cloud.kms.KeyManagementServiceClient`.
@@ -166,7 +166,7 @@ def encrypt_dek(
 
 
 def decrypt_dek(
-    encrypted: bytes, party: str, location: str = "global", version: int = 1, **kwargs
+    encrypted: bytes, party: str, location: str = "global", version: int | str = 1, **kwargs
 ) -> bytes:
     """
     Decrypt a data encryption key using an asymmetric key held on KMS.
@@ -183,8 +183,8 @@ def decrypt_dek(
         Name of the party whose key we are decrypting.
     location : str
         Location of the keyring on which the key lives.
-    version : int
-        Version of the assymetric key to get from GCP. Default is 1.
+    version : int | str
+        Version of the asymmetric key to get from GCP. Default is 1.
     **kwargs : dict
         Keyword arguments to pass when creating an instance of
         `google.cloud.kms.KeyManagementServiceClient`.