Editing Post Quantum Crypto (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
PQC is understood through the '''Quantum Threat''' and '''Mathematical Hardness'''.

'''1. The "Quantum Apocalypse" (Y2Q)''':
Most of the internet's trust is built on one simple math problem: "It is hard to factor two big prime numbers."
* Quantum computers use '''Superposition''' to check millions of "paths" to the factors at once.
* This isn't just a "faster computer," it's a '''New Physics'''.
* If a quantum computer is built before we switch to PQC, every bank account, every secret message, and every digital signature on Earth becomes vulnerable.

'''2. Finding 'Quantum-Hard' Problems''':
PQC researchers look for math that even a quantum computer finds hard.
* '''Lattices''': Imagine a grid of points in 500 dimensions. If I give you a random spot in space, can you find the ''closest'' grid point? Even with quantum tricks, this is an "unsolvable" task in a reasonable amount of time.
* '''Code-Based''': Based on the math of correcting errors in data transmissions (Error Correcting Codes).

'''3. Symmetric vs. Asymmetric''':
* '''Asymmetric (Public Key)''': Is '''Dead''' when quantum arrives. RSA and ECC must be replaced entirely by PQC.
* '''Symmetric (AES)''': Is '''Safe''' but "Weakened." A 128-bit key becomes as easy to break as a 64-bit key. To stay safe, we just need to double the key size to 256 bits.

'''Cryptographic Agility''': This is the most important lesson of PQC. We used to think encryption was "forever." PQC teaches us that we must build our software so that we can change the "Math" in 24 hours if a new threat is discovered.
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