Reasonably Secure Algorithm

With an n value this small, it can be quite easily cracked. I used RsaCtfTool (git clone https://github.com/Ganapati/RsaCtfTool), with the command:

python RsaCtfTool.py -n 126390312099294739294606157407778835887 -e 65537 --uncipher 13612260682947644362892911986815626931

actf{10minutes}