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+.. hazmat::
+
+Key Serialization
+=================
+
+.. currentmodule:: cryptography.hazmat.primitives.serialization
+
+There are several common schemes for serializing asymmetric private and public
+keys to bytes. They generally support encryption of private keys and additional
+key metadata.
+
+
+Traditional OpenSSL Format
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The "traditional" PKCS #1 based serialization format used by OpenSSL.
+It supports password based symmetric key encryption. Commonly found in
+OpenSSL based TLS applications. It is usually found in PEM format with a
+header that mentions the type of the serialized key. e.g.
+``-----BEGIN RSA PRIVATE KEY-----``.
+
+.. function:: load_pem_traditional_openssl_private_key(data, password, backend)
+
+    .. versionadded:: 0.5
+
+    Deserialize a private key from PEM encoded data to one of the supported
+    asymmetric private key types.
+
+    :param bytes data: The PEM encoded key data.
+
+    :param bytes password: The password to use to decrypt the data. Should
+        be ``None`` if the private key is not encrypted.
+    :param backend: A
+        :class:`~cryptography.hazmat.backends.interfaces.TraditionalOpenSSLSerializationBackend`
+        provider.
+
+    :returns: A new instance of a private key.
+
+    :raises ValueError: If the PEM data could not be decrypted or if its
+        structure could not be decoded successfully.
+
+    :raises TypeError: If a ``password`` was given and the private key was
+        not encrypted. Or if the key was encrypted but no
+        password was supplied.
+
+    :raises UnsupportedAlgorithm: If the serialized key is of a type that
+        is not supported by the backend or if the key is encrypted with a
+        symmetric cipher that is not supported by the backend.