What advantage do SSH keys provide over traditional passwords?

SSH keys provide a significant advantage over traditional passwords due to their ability to utilize significantly longer "secret" lengths between client and server. Unlike passwords, which are often limited in complexity and length based on user memory or usability, SSH keys are cryptographic keys that can be much longer and more complex.

The length and complexity of SSH keys enhance security because they are less vulnerable to brute-force attacks compared to typical password lengths. This complex key-based authentication mechanism means that even if an unauthorized individual attempts to compromise an SSH key, the sheer computational power required to crack a well-generated key is exceedingly high, making it practically infeasible.

In contrast to other options, shorter secret lengths would actually reduce security, and while reduced user intervention is a benefit, the key advantage primarily lies in the inherent complexity and strength of the keys themselves. Lastly, while some may find SSH keys easier to manage in certain contexts, they require their own management practices that may not necessarily be easier than traditional passwords in all scenarios. Therefore, the principal advantage of SSH keys is indeed their capacity for much longer secret lengths, significantly boosting security in the authentication process.