The article (as I understand it) discusses that by default, your SSH private key passphrase is essentially just a glorified MD5 hash, which is relatively easy to brute-force due to the speed at ...

For the first time, researchers have demonstrated that a large portion of cryptographic keys used to protect data in computer-to-server SSH traffic are vulnerable to complete compromise when ...

Thousands of routers, modems, IP cameras, VoIP phones and other embedded devices share the same hard-coded SSH host keys or HTTPS server certificates.

In them they found over 580 unique private keys for SSH and HTTPS, many of them shared between multiple devices from the same vendor or even from different ones.