Honey - 2018-08-31

I have tried with RSA implementation but on encripting i am getting some special character as chipher text.
My plain text is : Hello this is a pre production code
and
Chiper text is: �����{ٙH�Q� ��9 $���R v]�N��)� kI-�]�M_x�1�\�"Y?�=��4���kCf������ ��w�@}^w� ��H[Lݬ=�8M��wi�EѮ���f�4Q~���[�Ҭ_��7U�̠�s�y�j|(�|��y� EN휺��,�L��P���xR�>��y��N!����8���Ya�L`Z ���Q��[[���e���w\��*� ��e)�9�.q8��e(�՗��Kz�l6�

Please provide the solution for same.