A gentle introduction to lattice-based cryptography

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We present four quantum-safe schemes: the Kyber (ML-KEM) and FrodoKEM key encapsulation mechanisms, and the Dilithium (ML-DSA) and Falcon (FN-DSA) signature schemes. We also develop the mathematical background on lattices needed to understand why Kyber, FrodoKEM, Dilithium and Falcon are regarded as lattice-based cryptosystems, and we provide insight into the computational hardness of the underlying lattice problems. The exposition is intended to be accessible to senior undergraduate students an