diff --git a/crypt_algo.hpp b/crypt_algo.hpp
index d1e3940..ccef7d8 100644
--- a/crypt_algo.hpp
+++ b/crypt_algo.hpp
@@ -10,7 +10,6 @@
 namespace crypt
 {
 
-using buffer = std::vector<uint8_t>;
 using key = std::array<uint8_t, SHA_DIGEST_LENGTH>;
 
 /**
@@ -47,7 +46,7 @@
          * @param[in] - Session Integrity key to generate K2
          * @param[in] - Additional keying material to generate K2
          */
-        explicit Interface(const buffer& sik, const key& addKey);
+        explicit Interface(const std::vector<uint8_t>& sik, const key& addKey);
 
         Interface() = delete;
         virtual ~Interface() = default;
@@ -65,8 +64,8 @@
          *
          * @return decrypted payload if the operation is successful
          */
-        virtual buffer decryptPayload(
-                const buffer& packet,
+        virtual std::vector<uint8_t> decryptPayload(
+                const std::vector<uint8_t>& packet,
                 const size_t sessHeaderLen,
                 const size_t payloadLen) const = 0;
 
@@ -78,7 +77,8 @@
          * @return encrypted payload if the operation is successful
          *
          */
-        virtual buffer encryptPayload(buffer& payload) const = 0;
+        virtual std::vector<uint8_t> encryptPayload(
+                std::vector<uint8_t>& payload) const = 0;
 
         /**
          * @brief Check if the Confidentiality algorithm is supported
@@ -107,7 +107,7 @@
          * generated by processing a pre-defined constant keyed by Session
          * Integrity Key (SIK) that was created during session activation.
          */
-        key k2;
+        std::vector<uint8_t> k2;
 };
 
 /**
@@ -166,7 +166,7 @@
          *
          * @param[in] - Session Integrity key
          */
-        explicit AlgoAES128(const buffer& sik) : Interface(sik, const2) {}
+        explicit AlgoAES128(const std::vector<uint8_t>& sik) : Interface(sik, const2) {}
 
         AlgoAES128() = delete;
         ~AlgoAES128() = default;
@@ -184,8 +184,8 @@
          *
          * @return decrypted payload if the operation is successful
          */
-        buffer decryptPayload(
-                const buffer& packet,
+        std::vector<uint8_t> decryptPayload(
+                const std::vector<uint8_t>& packet,
                 const size_t sessHeaderLen,
                 const size_t payloadLen) const override;
 
@@ -197,7 +197,8 @@
          * @return encrypted payload if the operation is successful
          *
          */
-        buffer encryptPayload(buffer& payload) const override;
+        std::vector<uint8_t> encryptPayload(
+                std::vector<uint8_t>& payload) const override;
 
     private:
 
@@ -210,7 +211,7 @@
          *
          * @return decrypted data if the operation is successful
          */
-        buffer decryptData(const uint8_t* iv,
+        std::vector<uint8_t> decryptData(const uint8_t* iv,
                            const uint8_t* input,
                            const int inputLen) const;
 
@@ -222,7 +223,7 @@
          *
          * @return encrypted data if the operation is successful
          */
-        buffer encryptData(const uint8_t* input,
+        std::vector<uint8_t> encryptData(const uint8_t* input,
                            const int inputLen) const;
 };