diff --git a/test/e2e/internal/notation/file.go b/test/e2e/internal/notation/file.go
index 3dc6d7a4..049f36a9 100644
--- a/test/e2e/internal/notation/file.go
+++ b/test/e2e/internal/notation/file.go
@@ -19,8 +19,8 @@ import (
 	"os"
 )
 
-// CopyFile copies the source file to the destination file
-func CopyFile(src, dst string) error {
+// copyFile copies the source file to the destination file
+func copyFile(src, dst string) error {
 	in, err := os.Open(src)
 	if err != nil {
 		return err
diff --git a/test/e2e/internal/notation/host.go b/test/e2e/internal/notation/host.go
index 8128cc5b..0ad17854 100644
--- a/test/e2e/internal/notation/host.go
+++ b/test/e2e/internal/notation/host.go
@@ -231,7 +231,7 @@ func AddTimestampTrustStoreOption(namedstore string, srcCertPath string) utils.H
 // AddTrustPolicyOption adds a valid trust policy for testing.
 func AddTrustPolicyOption(trustpolicyName string) utils.HostOption {
 	return func(vhost *utils.VirtualHost) error {
-		return CopyFile(
+		return copyFile(
 			filepath.Join(NotationE2ETrustPolicyDir, trustpolicyName),
 			vhost.AbsolutePath(NotationDirName, TrustPolicyName),
 		)
@@ -241,7 +241,7 @@ func AddTrustPolicyOption(trustpolicyName string) utils.HostOption {
 // AddConfigJsonOption adds a valid config.json for testing.
 func AddConfigJsonOption(configJsonName string) utils.HostOption {
 	return func(vhost *utils.VirtualHost) error {
-		return CopyFile(
+		return copyFile(
 			filepath.Join(NotationE2EConfigJsonDir, configJsonName),
 			vhost.AbsolutePath(NotationDirName, ConfigJsonName),
 		)
@@ -262,7 +262,7 @@ func AddPlugin(pluginPath string) utils.HostOption {
 		if err := os.MkdirAll(e2ePluginDir, 0700); err != nil {
 			return err
 		}
-		return CopyFile(
+		return copyFile(
 			NotationE2EPluginPath,
 			filepath.Join(e2ePluginDir, "notation-"+PluginName),
 		)
diff --git a/test/e2e/internal/notation/key.go b/test/e2e/internal/notation/key.go
index efa9f581..fd11a385 100644
--- a/test/e2e/internal/notation/key.go
+++ b/test/e2e/internal/notation/key.go
@@ -68,10 +68,10 @@ func AddKeyPairs(destNotationConfigDir, srcKeyPath, srcCertPath string) error {
 	os.MkdirAll(localKeysDir, 0700)
 
 	// copy key and cert files
-	if err := CopyFile(srcKeyPath, filepath.Join(localKeysDir, keyName)); err != nil {
+	if err := copyFile(srcKeyPath, filepath.Join(localKeysDir, keyName)); err != nil {
 		return err
 	}
-	return CopyFile(srcCertPath, filepath.Join(localKeysDir, certName))
+	return copyFile(srcCertPath, filepath.Join(localKeysDir, certName))
 }
 
 // generateSigningKeys generates the signingkeys.json for notation.