diff --git a/src/process.rs b/src/process.rs
index 16d221b..6b57434 100644
--- a/src/process.rs
+++ b/src/process.rs
@@ -157,12 +157,18 @@ impl ProcessState {
             return Err(anyhow::anyhow!("State is identical to the previous state"));
         }
 
-        let mut fields2plains = Map::new();
-        let fields2commit = self.pcd_commitment.as_object().ok_or(anyhow::Error::msg("pcd_commitment is not an object"))?;
-        self.encrypted_pcd
-            .decrypt_all(self.commited_in, &fields2commit, &self.keys, &mut fields2plains)?;
+        let roles2rules = match self.encrypted_pcd.extract_roles() {
+            Ok(roles) => roles,
+            Err(_) => {
+                let mut fields2plains = Map::new();
+                let fields2commit = self.pcd_commitment.as_object().ok_or(anyhow::Error::msg("pcd_commitment is not an object"))?;
+                self.encrypted_pcd
+                    .decrypt_all(self.commited_in, &fields2commit, &self.keys, &mut fields2plains)?;
+
+                Value::Object(fields2plains).extract_roles()?
+            }
+        };
 
-        let roles2rules = Value::Object(fields2plains).extract_roles()?;
 
         // Check if each modified field satisfies at least one applicable rule across all roles
         let all_fields_validated = modified_fields.iter().all(|field| {