In terms of DoS possibilities, one doesn't need to replay old messages, they could just as easily send new ones or random garbage.
We could employ additional filtering techniques, but that increases processing time. And since modern hardware allows for very fast AES decryption, there is no particular gain in building additional layers of protection.
All that, naturally, implies that other anti-DoS measures are also being used.
We could employ additional filtering techniques, but that increases processing time. And since modern hardware allows for very fast AES decryption, there is no particular gain in building additional layers of protection.
All that, naturally, implies that other anti-DoS measures are also being used.