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ed25519 vs other keys for SSH
ed25519 vs other keys for SSH
is ed25519 better than rsa in terms of security and performance for SSH key pairs?
is this supported in Linux to Windows SSH password-less connection as ssh-key pair?
Ed25519 is generally considered more secure than RSA in terms of security, particularly for SSH key pairs. Here's why:
- Security: Ed25519 uses the EdDSA (Edwards-curve Digital Signature Algorithm) cryptographic signature scheme, which offers strong security properties and resistance to various cryptographic attacks. It has been designed with security in mind and is believed to be more resistant to certain types of attacks compared to RSA.
- Performance: Ed25519 often offers better performance than RSA for key generation, signing, and verification operations. This can result in faster SSH connections and lower computational overhead on both the client and server sides.
- Key Length: Ed25519 keys are shorter than RSA keys for equivalent security levels. Shorter keys can improve efficiency and reduce storage requirements.
- Algorithm Maturity: While RSA is a well-established cryptographic algorithm, Ed25519 is also widely recognized and has undergone extensive analysis and scrutiny by cryptographers.
Regarding support for Ed25519 key pairs in SSH password-less connections between Linux and Windows, it depends on the specific SSH implementations used:
- Linux: Most modern SSH clients and servers on Linux distributions support Ed25519 key pairs out of the box. You can generate Ed25519 keys using ssh-keygen and use them for password-less authentication.
- Windows: Support for Ed25519 key pairs in OpenSSH for Windows has been added in recent versions. If you're using OpenSSH on Windows, ensure you have a version that supports Ed25519 keys. You can generate Ed25519 keys on Windows using ssh-keygen as well.
Overall, if both your Linux and Windows systems support Ed25519 key pairs, it's a good choice for SSH password-less connections due to its security and performance benefits. However, compatibility considerations with older systems or specific configurations may require RSA keys in some cases.
