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masscan
TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
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That is almost a contradiction in terms. If there is a flaw in SSH (and there have been flaws), you are a sitting duck. SSH broadcasts it's version number, so hackers can know all the servers that are running vulnerable software the instant a vulnerability comes out. (Moving to a different port doesn't help, as anyone can scan the entire internet in 5 minutes.)
Syncthing might be a good option. I can't advocate for security/speed, as I've only used to a few times to send files between friends, but it worked pretty well.