If you’re wondering why RSA keys are more secure than the old DSA keys, they aren’t inherently so.
Upgrading to MacOS Sierra will break your SSH keys and lock you out of your own servers.
Quincy Larson

Why are you linking to an outdated StackOverflow answer? This newer answer suggest that there are indeed inherently weaknesses concerning DSA: http://security.stackexchange.com/a/46781/73579

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