## 02 Jan ed25519 vs ecdsa vs rsa

> Why are ED25519 keys better than RSA. The private keys and public keys are much smaller than RSA. Near term protection. New comments cannot be posted and votes cannot be cast. I can't decide between encryption algorithms, ECC (ed25519) or RSA (4096)? Then the ECDSA key will get recorded on the client for future use. Since Proton Mail says "State of the Art" and "Highest security", I think both are. embedded systems or older devices don't accept or support Ed25519 keys. Diffie-Hellman is used to exchange a key. In public-key cryptography, Edwards-curve Digital Signature Algorithm (EdDSA) is a digital signature scheme using a variant of Schnorr signature based on twisted Edwards curves. Ed25519 should be pretty safe - it's by Bernstein, but it's ultimately based on Elliptic curve math, so it isn't magical, just it uses trustworthy curve parameters that are publicly documented. Realistically though you're probably okay using ECC unless you're worried about a nation-state threat. Similarly, Ed25519 signatures are much shorter than RSA signatures; at this size, the difference is 512 versus vs 3072 bits. I am not a security expert so I was curious what the rest of the community thought about them and if they're secure to use. RSA was first standardized in 1994, and to date, it’s the most widely used algorithm. They have a blog post about the introduction of it in case you haven't read it: https://protonmail.com/blog/elliptic-curve-cryptography/. Two reasons: 1) they are a lot shorter for the same level of security and 2) any random number can be an Ed25519 key. This article aims to help explain RSA vs DSA vs ECDSA and how and when to use each algorithm. That is the one place that RSA shines; you can verify RSA signatures rather faster than you can verify an ECDSA signature. ECDSA vs RSA. The options are as follows: -A For each of the key types (rsa, dsa, ecdsa and ed25519) for which host keys do not exist, generate the host keys with the default key file path, an empty passphrase, default bits for the key type, and default comment. So I'll go ahead and use RSA as I don't want to manage two different types of keys within my environment. It is using an elliptic curve signature scheme, which offers better security than ECDSA and DSA. One of the biggest reasons to go with ed25519 is that it's immune to a lot of common side channels. Neither RSA nor ECC is without any downsides, but ECC seems to be the better option for most users since it should offer comparable or better security but takes less resources (and therefore time) during use for said comparable level of security. Although, this is not a deeply technical essay, the more impatient reader can check the end of the article for a quick TL;DR table with the summary of … affirmatively. Currently, the minimum recommended key length for RSA keys is 2048. At the same time, it also has good performance. The PuTTY keygen tool offers several other algorithms – DSA, ECDSA, Ed25519, and SSH-1 (RSA).. I'm curious if anything else is using ed25519 keys instead of RSA keys for their SSH connections. RSA key length : 1024 bits ECDSA / Ed25519 : 160 bits. Other notes. Curve25519 is one specific curve on which you can do Diffie-Hellman (ECDH). I’m not going to claim I know anything about Abstract Algebra, but here’s a primer. New comments cannot be posted and votes cannot be cast. RSA is universally supported among SSH clients while EdDSA performs much faster and provides the same level of security with significantly smaller keys. Ed25519 keys are much shorter than RSA keys; at this size, the difference is 256 versus 3072 bits. It is designed to be faster than existing digital signature schemes without sacrificing security. 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