diff --git a/include/ndn-cpp/security/sec-tpm-memory.hpp b/include/ndn-cpp/security/sec-tpm-memory.hpp
index 5761597..8203272 100644
--- a/include/ndn-cpp/security/sec-tpm-memory.hpp
+++ b/include/ndn-cpp/security/sec-tpm-memory.hpp
@@ -67,10 +67,10 @@
    * @return The signature, or a null pointer if signing fails.
    */  
   virtual Block 
-  sign(const uint8_t *data, size_t dataLength, const Name& keyName, DigestAlgorithm digestAlgorithm);
+  signInTpm(const uint8_t *data, size_t dataLength, const Name& keyName, DigestAlgorithm digestAlgorithm);
 
   virtual void 
-  sign(Data &data, const Name& keyName, DigestAlgorithm digestAlgorithm);
+  signInTpm(Data &data, const Name& keyName, DigestAlgorithm digestAlgorithm);
   
   /**
    * Decrypt data.
@@ -81,7 +81,7 @@
    * @return The decrypted data.
    */
   virtual ConstBufferPtr 
-  decrypt(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
+  decryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
 
   /**
    * Encrypt data.
@@ -92,7 +92,7 @@
    * @return The encrypted data.
    */
   virtual ConstBufferPtr
-  encrypt(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
+  encryptInTpm(const Name& keyName, const uint8_t* data, size_t dataLength, bool isSymmetric);
 
   /**
    * @brief Generate a symmetric key.
@@ -101,7 +101,7 @@
    * @param keySize The size of the key.
    */
   virtual void 
-  generateSymmetricKey(const Name& keyName, KeyType keyType, int keySize);
+  generateSymmetricKeyInTpm(const Name& keyName, KeyType keyType, int keySize);
 
   /**
    * Check if a particular key exists.
@@ -110,7 +110,7 @@
    * @return True if the key exists, otherwise false.
    */
   virtual bool
-  doesKeyExist(const Name& keyName, KeyClass keyClass);  
+  doesKeyExistInTpm(const Name& keyName, KeyClass keyClass);  
   
 private:
   class RsaPrivateKey;