git clone https://github.com/Ganapati/RsaCtfTool
cd RsaCtfTool
pip install -r requirements.txt
python ./RsaCtfTool.py -n 6823097956559906304718047559434503772935670794168872682087986860491266565197938988585578012131795379682740793915178580560097648572207445450501957620442660379247761L -e 65537 --uncipher 484661494807973176484841550022162356056969394230726278907827156279573785417739620605749085238379352332325669223692676583758711843467179784519220209212809010990483
replace n , e & c with ur challenge given number !!