Schneier: Mythos Era Reshapes the Cyber Offense-Defense Balance
What Happened
Schneier's analysis of Anthropic's Mythos capability concludes that the offense-defense impact depends entirely on system architecture. Modern auto-updating software benefits hugely. Legacy industrial systems, IoT devices, and air-gapped networks remain exposed because they cannot absorb continuous patching. He proposes new defensive doctrines for legacy estates.
My Take
Schneier is doing the work everyone else won't: pointing out that "AI helps defenders" is true only for the 20% of the world's code that gets patched. The other 80% — utilities, hospitals, manufacturing PLCs, embedded firmware — just got more dangerous to operate. Boards should be asking CISOs to map their patch-velocity by asset class this quarter. The answer will horrify most of them, and that horror is the start of an actual budget conversation.
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