There is no one perfect wall.
Every wall has a day
someone finds the gap.
So don't bet everything
on a single defense.
Bet on layers.
Validate at the edge —
and also check again deeper.
Authenticate —
and also limit what each role can reach.
Encrypt in transit —
and also at rest.
Any one layer can fail.
The point is that they don't fail together.
A breach through the first wall
should still hit a second, and a third,
each one buying time,
each one shrinking the blast.
One flawless barrier is a fantasy.
Several imperfect ones
are how real systems survive.
Assume the wall falls.
Build the next one behind it.
– Serguey Asael Shinder
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