diff --git a/security/authgraph/default/src/fuzzer.rs b/security/authgraph/default/src/fuzzer.rs
index d401777..387d72f 100644
--- a/security/authgraph/default/src/fuzzer.rs
+++ b/security/authgraph/default/src/fuzzer.rs
@@ -22,10 +22,9 @@
 use authgraph_nonsecure::LocalTa;
 use binder_random_parcel_rs::fuzz_service;
 use libfuzzer_sys::fuzz_target;
-use std::sync::{Arc, Mutex};
 
 fuzz_target!(|data: &[u8]| {
     let local_ta = LocalTa::new().expect("Failed to create an AuthGraph local TA.");
-    let service = AuthGraphService::new_as_binder(Arc::new(Mutex::new(local_ta)));
+    let service = AuthGraphService::new_as_binder(local_ta);
     fuzz_service(&mut service.as_binder(), data);
 });
diff --git a/security/authgraph/default/src/lib.rs b/security/authgraph/default/src/lib.rs
index 14741aa..1f851b2 100644
--- a/security/authgraph/default/src/lib.rs
+++ b/security/authgraph/default/src/lib.rs
@@ -22,36 +22,62 @@
     ta::{AuthGraphTa, Role},
 };
 use authgraph_hal::channel::SerializedChannel;
-use std::sync::{Arc, Mutex};
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::sync::{mpsc, Mutex};
 
 /// Implementation of the AuthGraph TA that runs locally in-process (and which is therefore
 /// insecure).
 pub struct LocalTa {
-    ta: Arc<Mutex<AuthGraphTa>>,
+    channels: Mutex<Channels>,
+}
+
+struct Channels {
+    in_tx: mpsc::Sender<Vec<u8>>,
+    out_rx: mpsc::Receiver<Vec<u8>>,
 }
 
 impl LocalTa {
     /// Create a new instance.
     pub fn new() -> Result<Self, error::Error> {
-        Ok(Self {
-            ta: Arc::new(Mutex::new(AuthGraphTa::new(
+        // Create a pair of channels to communicate with the TA thread.
+        let (in_tx, in_rx) = mpsc::channel();
+        let (out_tx, out_rx) = mpsc::channel();
+
+        // The TA code expects to run single threaded, so spawn a thread to run it in.
+        std::thread::spawn(move || {
+            let mut ta = AuthGraphTa::new(
                 keyexchange::AuthGraphParticipant::new(
                     boring::crypto_trait_impls(),
-                    Box::<boring::test_device::AgDevice>::default(),
+                    Rc::new(RefCell::new(boring::test_device::AgDevice::default())),
                     keyexchange::MAX_OPENED_SESSIONS,
-                )?,
+                )
+                .expect("failed to create AG participant"),
                 Role::Both,
-            ))),
+            );
+            // Loop forever processing request messages.
+            loop {
+                let req_data: Vec<u8> = in_rx.recv().expect("failed to receive next req");
+                let rsp_data = ta.process(&req_data);
+                out_tx.send(rsp_data).expect("failed to send out rsp");
+            }
+        });
+        Ok(Self {
+            channels: Mutex::new(Channels { in_tx, out_rx }),
         })
     }
 }
 
-/// Pretend to be a serialized channel to the TA, but actually just directly invoke the TA with
-/// incoming requests.
 impl SerializedChannel for LocalTa {
     const MAX_SIZE: usize = usize::MAX;
 
-    fn execute(&mut self, req_data: &[u8]) -> binder::Result<Vec<u8>> {
-        Ok(self.ta.lock().unwrap().process(req_data))
+    fn execute(&self, req_data: &[u8]) -> binder::Result<Vec<u8>> {
+        // Serialize across both request and response.
+        let channels = self.channels.lock().unwrap();
+        channels
+            .in_tx
+            .send(req_data.to_vec())
+            .expect("failed to send in request");
+        Ok(channels.out_rx.recv().expect("failed to receive response"))
     }
 }
diff --git a/security/authgraph/default/src/main.rs b/security/authgraph/default/src/main.rs
index 81f2dd6..ced7567 100644
--- a/security/authgraph/default/src/main.rs
+++ b/security/authgraph/default/src/main.rs
@@ -25,7 +25,6 @@
 use authgraph_hal::service;
 use authgraph_nonsecure::LocalTa;
 use log::{error, info};
-use std::sync::{Arc, Mutex};
 
 static SERVICE_NAME: &str = "android.hardware.security.authgraph.IAuthGraphKeyExchange";
 static SERVICE_INSTANCE: &str = "nonsecure";
@@ -65,9 +64,8 @@
     binder::ProcessState::start_thread_pool();
 
     // Register the service
-    let local_ta =
-        LocalTa::new().map_err(|e| format!("Failed to create the TA because: {e:?}"))?;
-    let service = service::AuthGraphService::new_as_binder(Arc::new(Mutex::new(local_ta)));
+    let local_ta = LocalTa::new().map_err(|e| format!("Failed to create the TA because: {e:?}"))?;
+    let service = service::AuthGraphService::new_as_binder(local_ta);
     let service_name = format!("{}/{}", SERVICE_NAME, SERVICE_INSTANCE);
     binder::add_service(&service_name, service.as_binder()).map_err(|e| {
         format!(