Public-key cryptography (encryption is a misnomer) is the process of creating two keys during the encryption of plain text, one private and one public.

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How, if at all, do SSH keys differ from asymmetric keys used for other purposes?

How, if at all, do SSH keys differ from asymmetric keys used for other purposes, e.g. email signing? I'm prompted to ask this, in part, because on OS X, there are apps available to manage SSH keys ...
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How to setup ssh, key-based (“password-less”) logins to a Linux/MacOSX sshd server via Windows, Linux, or MacOSX clients?

How does one setup ssh, key-based ("password-less") client logins to a Linux/MacOSX sshd server via Windows, Linux, or MacOSX clients? [Seeking both basic, conceptual understanding of key-based, ...