Mattia Castagno
From minutes to millennia: enhancing power analysis resistance in AES and ASCON.
Rel. Guido Masera, Mattia Mirigaldi. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Elettronica (Electronic Engineering), 2024
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Abstract
Cryptographic algorithms are an important pillar in the digital world because they protect the content of sensitive data ensuring security in communication. Their strength lies in the mathematical complexity that underlies them. Thanks to it, the encryption of data is performed in a very simple way, while the reverse operation requires a huge amount of work in the case in which all the parameters used to perform it are not known. This peculiarity ensures strong protection against direct attacks such as brute force attacks or more advanced techniques such as linear or differential cryptanalysis, which would require millennia to recover with certainty the value of the cryptographic key.
However, with the advent of a new class of attacks, known as side-channel attacks (SCA), this security has disappeared, since they no longer aim to discover the key based on the mathematical structure on which they are based, but they exploit weaknesses in the physical implementation of the algorithm, such as execution time or power consumed
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