Clicking on the link on provided site gave us the Source code.
In there it asked us to give it a password that is not AdM1nP@assW0rd! and the crc8 and crc16 of the password should match the crc8 and crc16 of provided string, This is case of CRC collision, brute forcing for a string with matching crc8 and crc16 gave us the password.