Huh? TLS has PSK ciphers. They're popular in low-power IoT devices, because even ecc crypto is rather expensive, compared to e.g. AES. I'm not sure if any of t

Huh? TLS has PSK ciphers. They're popular in low-power IoT devices, because even ecc crypto is rather expensive, compared to e.g. AES. I'm not sure if any of the PSK modes manage to work with perfect forward secrecy though. Otherwise, leaking the PSK would also allow decrypting any previously-sniffed traffic.