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Attackers run a look-alike admin console that passes each sign-in to the real one as it happens. Others hold old admin passwords and take over phone numbers. Pick the second sign-in step for 40 admins. Allow 0 attacker sign-ins. Keep admin p99 under 1 s.

Goals

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Requests served each second.Requests served each second.The share of requests that get a correct answer.99 of 100 requests finish faster than this.What the servers and services cost each month.
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Text message codes
Authenticator app codes
Passkeys