diff --git cryptopp_inc.h cryptopp_inc.h
index 1295d7c..51ab406 100644
--- cryptopp_inc.h
+++ cryptopp_inc.h
@@ -44,4 +44,9 @@
 #include CRYPTOPP_INCLUDE_ECCRYPTO
 #include CRYPTOPP_INCLUDE_OIDS
 #include CRYPTOPP_INCLUDE_DSA
-#endif
\ No newline at end of file
+#endif
+#if (CRYPTOPP_VERSION >= 600) && (__cplusplus >= 201103L)
+  using byte = CryptoPP::byte;
+#else
+  typedef unsigned char byte;
+#endif