Never use standard programming language random libraries (like Python's default random ).
: Checking if the server-side generator produces truly random codes or follows a discoverable pattern.
Attackers use tools like Evilginx to stand between the user and the real website. When the user types their valid OTP into the fake site, the attacker intercepts it and logs in instantly.
: Throttling total traffic to prevent distributed botnet attacks. Long Token Lifespans