Quantum Computers Are Not a Threat to 128-Bit Symmetric Keys | Hacker News

The discussion says quantum computers are not a practical brute-force threat to 128-bit symmetric keys.

The bigger concern is asymmetric key exchange, such as ECDSA, and captured TLS traffic that could be decrypted later.

Mitigations focus on post-quantum migration, especially for key exchange, rather than replacing strong symmetric ciphers.

Aggressive key rotation and better key management, including JWKS handling, are seen as ways to reduce exposure windows.