I'm not new to programming, but this is something I've never really had to do before (I'm also not exactly sure what to search for on google). Some of the missions have extremely short times to complete them (such as 3 seconds with the Ceaser Cipher), and that's not enough time to copy and paste the necessary input into my program.
How would I go about having my program logging into HTS and downloading the challenge page, and then submitting the correct answer? If I just try and directly download the page it will give me a login error. Perhaps I could do this by sending a custom HTTP header with a login cookie or something of that sort? I'm really clueless here though, thanks for any help.