Anirban Ghatak, Kaushik Sarkar, Anupam Chattopadhyay, Ambrish Awasthi, Indivar Gupta · 2026 · Research Square
DOI: 10.21203/rs.3.rs-9706347/v1 · cited by 0 works (OpenAlex) · open-access PDF
Le chiffreur de flux Espresso a été conçu par E. Dubrova et M. Hell comme un candidat matériel-efficace pour la sécurité 5G. Il a deux composants - un registre binaire de changement de rétroaction non linéaire de 256 bits (NFSR), avec 14 touches de rétroaction, et une fonction de sortie non linéaire de 20 variables. Toutefois, la sécurité d'Espresso en ce qui concerne plusieurs attaques cryptanalytiques standard est estimée à l'aide d'un NFSR alternatif, qui n'a que deux touches de rétroaction. L'analyse ci-dessus est basée sur l'affirmation que ce NFSR alternatif est obtenu à l'aide d'un algorithme de transformation qui préserve la séquence de sortie du NFSR
Machine translation (Meta M2M100); the English original follows.
The stream cipher Espresso was designed by E. Dubrova and M. Hell as a hardware-efficient candidate for 5G security. It has two components - a 256-bit binary non-linear feedback shift register (NFSR), with 14 feedback taps, and a 20-variable non-linear output function. However, the security of Espresso with regard to several standard cryptanalytic attacks are estimated using an alternate NFSR, which has only two feedback taps. The above analysis is based on the claim that this alternate NFSR is obtained using a transformation algorithm which preserves the output sequence of the original NFSR.
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Topics: Linear feedback shift register, Arithmetic, Shift register, Transformation (genetics), Computer science, Stream cipher
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