typo

bgn2/inc/BGN.hpp

@@ -26,7 +26,7 @@ class BGN
         Scalar decrypt(const Quadripoint& ciphertext) const;
 
         const PublicKey& get_public_key() const;
-        const PublicKey& get_private_key() const;
+        const PrivateKey& get_private_key() const;
 
 	private:
 		PublicKey public_key;