Quantum cryptography describes the use of quantum mechanical effects to perform cryptographic tasks or to break cryptographic systems.

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what is the motivation and need for lattice-based systems in epassports in post- quantum computers era?

AS shor's algo would break the RSA and DH (though I dont understand the complete steps of shor's algo), all protocols of epassports would be broken so why cant it be not broken with lattice-crypto, ...
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So what is quantum cryptography anyway?

I am having difficulty understanding quantum cryptography concepts. I've searched the internet and watched some videos on youtube explaining the topic, but it is still hard to understand how it works. ...