#OPENSSH PUBLIC KEY FORMAT UPGRADE#

But compared to Ed25519, it’s slower and even considered not safe if it’s generated with the key smaller than 2048-bit length. Today, the RSA is the most widely used public-key algorithm for SSH key. It’s using elliptic curve cryptography that offers a better security with faster performance compared to DSA or ECDSA. It’s the EdDSA implementation using the Twisted Edwards curve. The Ed25519 was introduced on OpenSSH version 6.5.

✅ Ed25519 : It’s the most recommended public-key algorithm available today!.

There’s also a trustworthiness concern on the NIST curves that being used by ECDSA.

👀 ECDSA : It depends on how well your machine can generate a random number that will be used to create a signature.The 1024-bit length is even considered unsafe.

#OPENSSH PUBLIC KEY FORMAT UPGRADE#

Less than that, you probably want to upgrade it. If it has 3072 or 4096-bit length, then you’re good. 🚨 DSA : It’s unsafe and even no longer supported since OpenSSH version 7, you need to upgrade it!.Your SSH keys might use one of the following algorithms: To check all available SSH keys on your computer, run the following command on your terminal: for key in ~/.ssh/id_* do ssh-keygen -l -f '$' done | uniq Check Available SSH Keys on Your Computer It provides us with better security than the traditional password-based authentication.īut, when is the last time you created or upgraded your SSH key? And did you use the latest recommended public-key algorithm? If it was more than five years ago and you generated your SSH key with the default options, you probably ended up using RSA algorithm with key-size less than 2048 bits long. Whether it’s for logging into the remote server or when pushing your commit to the remote repository. If you’re a DevOps engineer or a web developer, there’s a good chance that you’re already familiar and using the SSH key authentication on a daily basis. Upgrade your SSH key! Photo by Matt Artz on Unsplash

Openssh public key format