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You could hardly have a UNIX system without chmod. You'd be unable to prevent anyone from reading your files -- or, if the default umask is set in a draconian manner, unable to allow anyone to read...

Hasn't RSA been cracked? ssh uses DSA these days.

This doesn't mean you shouldn't still think about other vectors. How do these executables get signed? Any vulnerabilities in that and bam, you might as well have not had it. Hm.

Which shell? A...

As long as he has access to files, echo -e or printf, and chmod, he has the ability to copy in executables from somewhere else. Not difficult, just tedious. And then they can craft a busybox or...