diff --git a/ChangeLog.rst b/ChangeLog.rst
index 61eb4a2..6894a65 100644
--- a/ChangeLog.rst
+++ b/ChangeLog.rst
@@ -28,7 +28,8 @@ wolfCrypt-py Release 5.9.2 (Jul 1, 2026)
 * Address many small issues found by Fenrir
 * Add reseed support to random number generator
 * The RsaPublic key parameter is now mandatory as it is always needed by an internal function call.
-* Add typing annotations
+* The `native_object` attribute of `Random` is now read-only.
+* Add typing annotations.
 
 
 wolfCrypt-py Release 5.8.4 (Jan 7, 2026)
diff --git a/tests/test_mldsa.py b/tests/test_mldsa.py
index 7a24ab4..154e457 100644
--- a/tests/test_mldsa.py
+++ b/tests/test_mldsa.py
@@ -226,6 +226,14 @@ if _lib.ML_DSA_ENABLED:
         signature_from_same_seed = mldsa_priv.sign_with_seed(message, signature_seed, ctx=context)
         assert signature == signature_from_same_seed
 
+    @pytest.mark.parametrize("seed", [0, "seed"])
+    def test_sign_with_seed_bad_type(mldsa_type, rng, seed: int | str):
+        mldsa_priv = MlDsaPrivate.make_key(mldsa_type, rng)
+        message = b"This is a test message for ML-DSA signature"
+        context = b"Some context for the signature"
+        with pytest.raises(TypeError):
+            mldsa_priv.sign_with_seed(message, seed, ctx=context)
+
     def test_make_key_from_seed(mldsa_type):
         seed = bytes(MlDsaPrivate.ML_DSA_KEYGEN_SEED_LENGTH)
         assert MlDsaPrivate.make_key_from_seed(mldsa_type, seed)
@@ -237,3 +245,8 @@ if _lib.ML_DSA_ENABLED:
         seed = bytes(seed_length)
         with pytest.raises(ValueError):
             MlDsaPrivate.make_key_from_seed(mldsa_type, seed)
+
+    @pytest.mark.parametrize("seed", [0, "seed"])
+    def test_make_key_from_seed_bad_type(mldsa_type, seed: int | str):
+        with pytest.raises(TypeError):
+            MlDsaPrivate.make_key_from_seed(mldsa_type, seed)
diff --git a/tests/test_mlkem.py b/tests/test_mlkem.py
index 515b2f6..a37c241 100644
--- a/tests/test_mlkem.py
+++ b/tests/test_mlkem.py
@@ -617,6 +617,21 @@ if _lib.ML_KEM_ENABLED:
         ss_recv = mlkem_priv.decapsulate(ct)
         assert ss_send == ss_recv
 
+    @pytest.mark.parametrize("mlkem_type", mlkem_types)
+    @pytest.mark.parametrize("rand", [0, "rand"])
+    def test_make_key_with_random_bad_random_type(mlkem_type, rand: int | str):
+        with pytest.raises(TypeError):
+            MlKemPrivate.make_key_with_random(mlkem_type, rand)
+
+    @pytest.mark.parametrize("mlkem_type", mlkem_types)
+    @pytest.mark.parametrize("rand", [0, "rand"])
+    def test_encapsulate_with_random_bad_random_type(mlkem_type, rand: int | str):
+        mlkem_pub = MlKemPublic(mlkem_type)
+        assert type(mlkem_pub) is MlKemPublic
+
+        with pytest.raises(TypeError):
+            mlkem_pub.encapsulate_with_random(rand)
+
     @pytest.mark.parametrize("mlkem_type", mlkem_types)
     def test_size_properties(mlkem_type):
         refvals = {
diff --git a/wolfcrypt/ciphers.py b/wolfcrypt/ciphers.py
index 61a9b21..2b5fa9d 100644
--- a/wolfcrypt/ciphers.py
+++ b/wolfcrypt/ciphers.py
@@ -174,7 +174,7 @@ class _Cipher(ABC):
 
     @property
     @abstractmethod
-    def key_size(self) -> int: ...
+    def key_size(self) -> int | None: ...
 
     @property
     @abstractmethod
@@ -2148,6 +2148,14 @@ if _lib.ML_KEM_ENABLED:
             :rtype: MlKemPrivate
             """
             mlkem_priv = cls(mlkem_type)
+
+            try:
+                memoryview(rand)
+            except TypeError as exception:
+                raise TypeError("rand must support the buffer protocol, such as `bytes` or `bytearray`") from exception
+
+            rand = bytes(rand)
+
             ret = _lib.wc_KyberKey_MakeKeyWithRandom(mlkem_priv.native_object, rand, len(rand))
 
             if ret < 0:  # pragma: no cover
diff --git a/wolfcrypt/hashes.py b/wolfcrypt/hashes.py
index 737bcc2..f1386a0 100644
--- a/wolfcrypt/hashes.py
+++ b/wolfcrypt/hashes.py
@@ -69,7 +69,7 @@ class _Hash(ABC):
 
     @property
     @abstractmethod
-    def digest_size(self) -> int: ...
+    def digest_size(self) -> int | None: ...
 
     @classmethod
     @abstractmethod