The cube attack is a powerful cryptanalysis technique against symmetric primitives, especially for stream ciphers. One of the key step in recovering superpoly. division property has been introduced to attacks with aim first identify variables/monomials that are not involved Recently, some improved versions this allowing recovery exact superpoly have developed and applied on various ciphers [13,...

This paper proposes a new method to solve certain classes of systems of multivariate equations over the binary field and its cryptanalytical applications. We show how heuristic optimization methods such as hill climbing algorithms can be relevant to solving systems of multivariate equations. A characteristic of equation systems that may be efficiently solvable by the means of such algorithms is...

The eStream cipher proposal Trivium outputs an XOR sum of six internal state bits. These in turn are obtained from 18 bits linearly, plus six ANDings of two bits each. We show that 4 of the 18 linear terms cancel between themselves.

Fault analysis is a powerful attack to stream ciphers. Up to now, the major idea of fault analysis is to simplify the cipher system by injecting some soft faults. We call it soft fault analysis. As a hardware–oriented stream cipher, Trivium is weak under soft fault analysis. In this paper we consider another type of fault analysis of stream cipher, which is to simplify the cipher system by inje...

Programme de l’année 2021-2022 : Histoire la philosophie et l’exégèse d’Aristote, du Trivium, Quadrivium l’enseignement à Byzance dans l’après-Byzance. A. Les opuscules, corpus, scholies schémas logique dus à Jean Chortasménos (ca 1370-1431), étude édition (suite) ; B. Illustration schématique des Premiers Seconds Analytiques les manuscrits byzantins post-byzantins, C. Tradition, exégèse enseig...