  The aim of this paper is to elucidate the implications of quantum computing
in present cryptography and to introduce the reader to basic post-quantum
algorithms. In particular the reader can delve into the following subjects:
present cryptographic schemes (symmetric and asymmetric), differences between
quantum and classical computing, challenges in quantum computing, quantum
algorithms (Shor's and Grover's), public key encryption schemes affected,
symmetric schemes affected, the impact on hash functions, and post quantum
cryptography. Specifically, the section of Post-Quantum Cryptography deals with
different quantum key distribution methods and mathematicalbased solutions,
such as the BB84 protocol, lattice-based cryptography, multivariate-based
cryptography, hash-based signatures and code-based cryptography.
