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diff --git a/libtransport/includes/hicn/transport/auth/signer.h b/libtransport/includes/hicn/transport/auth/signer.h
new file mode 100644
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+++ b/libtransport/includes/hicn/transport/auth/signer.h
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+/*
+ * Copyright (c) 2017-2021 Cisco and/or its affiliates.
+ * 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.
+ */
+
+#pragma once
+
+#include <hicn/transport/auth/common.h>
+#include <hicn/transport/errors/errors.h>
+
+extern "C" {
+#include <parc/security/parc_PublicKeySigner.h>
+#include <parc/security/parc_Security.h>
+#include <parc/security/parc_Signer.h>
+#include <parc/security/parc_SymmetricKeySigner.h>
+}
+
+namespace transport {
+namespace auth {
+
+class Signer {
+  // The base class from which all signer classes derive.
+ public:
+  Signer();
+
+  Signer(PARCSigner *signer);
+
+  virtual ~Signer();
+
+  // Sign a packet.
+  virtual void signPacket(PacketPtr packet);
+
+  // Set the signer object used to sign packets.
+  void setSigner(PARCSigner *signer);
+
+  // Return the signature size.
+  size_t getSignatureSize() const;
+
+  // Return the crypto suite associated to the signer.
+  CryptoSuite getCryptoSuite() const;
+
+  // Return the hash algorithm associated to the signer.
+  CryptoHashType getCryptoHashType() const;
+
+  // Return the PARC signer.
+  PARCSigner *getParcSigner() const;
+
+  // Return the PARC key store containing the signer key.
+  PARCKeyStore *getParcKeyStore() const;
+
+ protected:
+  PARCSigner *signer_;
+  PARCKeyId *key_id_;
+};
+
+class AsymmetricSigner : public Signer {
+  // This class uses asymmetric verification to sign packets. The public key
+  // must be given from a PARCKeyStore.
+ public:
+  AsymmetricSigner() = default;
+  AsymmetricSigner(PARCSigner *signer) : Signer(signer){};
+
+  // Construct an AsymmetricSigner from a key store and a given crypto suite.
+  AsymmetricSigner(CryptoSuite suite, PARCKeyStore *key_store);
+};
+
+class SymmetricSigner : public Signer {
+  // This class uses symmetric verification to sign packets. The symmetric
+  // key is derived from a passphrase.
+ public:
+  SymmetricSigner() = default;
+  SymmetricSigner(PARCSigner *signer) : Signer(signer){};
+
+  // Construct an SymmetricSigner from a key store and a given crypto suite.
+  SymmetricSigner(CryptoSuite suite, PARCKeyStore *key_store);
+
+  // Construct an AsymmetricSigner from a passphrase and a given crypto suite.
+  SymmetricSigner(CryptoSuite suite, const std::string &passphrase);
+};
+
+}  // namespace auth
+}  // namespace transport