Earlier quoted context omitted.
SSH was a replacement for Telnet. But any weaknesses at the TTY level is orthogonal to that, right? Unless you mean, having thin clients use SSH as opposed to directly running serial cables throughout a building to VT100 style hardware terminals, and therefore being vulnerable to eavesdropping and hijacking? But I think when we talk about TTY we mostly don’t refer to that kind of situation. If someone talks about TTY…
SSH was a replacement for RSH, not telnet.
> I wrote the initial version of SSH (Secure Shell) in Spring 1995. It was a time when telnet and FTP were widely used.
> Anyway, I designed SSH to replace both telnet (port 23) and ftp (port 21). Port 22 was free. It was conveniently between the ports for telnet and ftp. I figured having that port number might be one of those small things that would give some aura of credibility. But how could I get that port number? I had never allocated one, but I knew somebody who had allocated a port.
Emphasis mine.
Cheers.