I'm a bit paranoid and often want to download from https. Here's via http http://releases.ubuntu.com/17.10.1/SHA256SUMS I could not find it via https. Actually I just need sha256sums via https, download itself don't care. My question is different to another question as I'm interested about ISO sha256sums and ISO itself.
I also found that https://bugs.launchpad.net/ubuntu-website-content/+bug/1534967