umm, no. I have 1024 bit keys and they have continued to work fine from my Mac to various servers that have the corresponding public key. (yes they should be updated, but I have larger keys for other servers).
I use the stock ssh in /usr/bin/ssh
Perhaps you had dsa keys? Those were deprecated and support for them was dropped.
> You can leave this blank or add a password for a little extra security (and a lot more typing).
Please please stop saying things like this. If typing the password is inconvenient to you, store it in your keychain. OS X/macOS makes this trivially easy. Having a pass phrase on your private key is (almost) as important as using a key with sufficient entropy.
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[ 2.9 ms ] story [ 9.8 ms ] threadI use the stock ssh in /usr/bin/ssh
Perhaps you had dsa keys? Those were deprecated and support for them was dropped.
Please please stop saying things like this. If typing the password is inconvenient to you, store it in your keychain. OS X/macOS makes this trivially easy. Having a pass phrase on your private key is (almost) as important as using a key with sufficient entropy.