ys7.com

RSA-2048 (≈112-bit classical security) is still fine today. At the same security level, ECDSA P-256 or Ed25519 keys and signatures are several times smaller and the handshake cheaper — worth considering at the next renewal.

RSA-2048 is a sound choice today. It is, however, quantum-vulnerable: NIST IR 8547 (draft) plans to disallow classical signature algorithms — ECDSA, EdDSA and RSA — after 2035, and this key sits at the 112-bit security level that the same draft deprecates one step earlier, after 2030. No penalty and no emergency — but certificate rotation is the easy part; knowing everywhere else your systems sign is the real migration work.