diff --git a/libs/service_vm_comm/Android.bp b/libs/service_vm_comm/Android.bp
index 9bce2f4..a7481e5 100644
--- a/libs/service_vm_comm/Android.bp
+++ b/libs/service_vm_comm/Android.bp
@@ -21,6 +21,7 @@
         "libcore.rust_sysroot",
     ],
     rustlibs: [
+        "libciborium_nostd",
         "libcoset_nostd",
         "liblog_rust_nostd",
         "libserde_nostd",
@@ -31,6 +32,7 @@
     name: "libservice_vm_comm",
     defaults: ["libservice_vm_comm_defaults"],
     rustlibs: [
+        "libciborium",
         "libcoset",
         "liblog_rust",
         "libserde",
diff --git a/libs/service_vm_comm/src/message.rs b/libs/service_vm_comm/src/message.rs
index a4ec46f..570cf38 100644
--- a/libs/service_vm_comm/src/message.rs
+++ b/libs/service_vm_comm/src/message.rs
@@ -101,6 +101,12 @@
 
     /// Any key to sign lacks a valid MAC. Maps to `STATUS_INVALID_MAC`.
     InvalidMac,
+
+    /// No payload found in a key to sign.
+    KeyToSignHasEmptyPayload,
+
+    /// An error happened when serializing to/from a `Value`.
+    CborValueError,
 }
 
 impl fmt::Display for RequestProcessingError {
@@ -111,6 +117,10 @@
             }
             Self::CosetError => write!(f, "Encountered an error with coset"),
             Self::InvalidMac => write!(f, "A key to sign lacks a valid MAC."),
+            Self::KeyToSignHasEmptyPayload => write!(f, "No payload found in a key to sign."),
+            Self::CborValueError => {
+                write!(f, "An error happened when serializing to/from a CBOR Value.")
+            }
         }
     }
 }
@@ -122,6 +132,13 @@
     }
 }
 
+impl From<ciborium::value::Error> for RequestProcessingError {
+    fn from(e: ciborium::value::Error) -> Self {
+        error!("CborValueError: {e}");
+        Self::CborValueError
+    }
+}
+
 /// Represents the params passed to GenerateCertificateRequest
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct GenerateCertificateRequestParams {