![]() ![]() It only contains 68 characters, compared to RSA 3072 that has 544 characters. 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. SSH KEYGEN ED25519 UPGRADELess 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 ![]()
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