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diff --git a/src/core/tsi/alts/frame_protector/alts_frame_protector.h b/src/core/tsi/alts/frame_protector/alts_frame_protector.h
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+++ b/src/core/tsi/alts/frame_protector/alts_frame_protector.h
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+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_ALTS_FRAME_PROTECTOR_H
+#define GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_ALTS_FRAME_PROTECTOR_H
+
+#include <grpc/support/port_platform.h>
+
+#include <stdbool.h>
+
+#include "src/core/tsi/transport_security_interface.h"
+
+typedef struct alts_frame_protector alts_frame_protector;
+
+/**
+ * TODO: Add a parameter to the interface to support the use of
+ * different record protocols within a frame protector.
+ *
+ * This method creates a frame protector.
+ *
+ * - key: a symmetric key used to seal/unseal frames.
+ * - key_size: the size of symmetric key.
+ * - is_client: a flag indicating if the frame protector will be used at client
+ *   (is_client = true) or server (is_client = false) side.
+ * - is_rekey: a flag indicating if the frame protector will use an AEAD with
+ *   rekeying.
+ * - max_protected_frame_size: an in/out parameter indicating max frame size
+ *   to be used by the frame protector. If it is nullptr, the default frame
+ *   size will be used. Otherwise, the provided frame size will be adjusted (if
+ *   not falling into a valid frame range) and used.
+ * - self: a pointer to the frame protector returned from the method.
+ *
+ * This method returns TSI_OK on success and TSI_INTERNAL_ERROR otherwise.
+ */
+tsi_result alts_create_frame_protector(const uint8_t* key, size_t key_size,
+                                       bool is_client, bool is_rekey,
+                                       size_t* max_protected_frame_size,
+                                       tsi_frame_protector** self);
+
+#endif /* GRPC_CORE_TSI_ALTS_FRAME_PROTECTOR_ALTS_FRAME_PROTECTOR_H */