SYMMETRIC CRYPTOGRAPHY: DESIGN & CRYPTANALYSIS Lorenzo Grassi
21-11-2019 - 11:00
Largo San Leonardo Murialdo,1 - Pal.C - Stanza 211 Block ciphers are certainly among the most important cryptographic primitives.
Their design and analysis are well advanced, and with today’s knowledge designing a secure block cipher is a problem that is largely considered solved.
Since it is not possible to prove mathematically the security of a symmetric scheme, the security of symmetric cipher is always against specific attacks.
In this presentation, we focus on "differential cryptanalysis", probably one of the most powerful attack in symmetric cryptography. It was introduced by Biham and Shamir in the late 1980s in order to break full DES. After a brief
introduction using SPN toy ciphers, we analyze how the "Wide Trail Design Strategy” can be exploited in order to guarantee security against such attack.
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