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Equivalent Non-linear Shift Register Transformations and Espresso

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

Indonesian

Espresso dirancang oleh E. Dubrova dan M. Hell sebagai kandidat efisiensi perangkat keras untuk keamanan 5G. Ini memiliki dua komponen - 256-bit biner non-linear feedback shift registry (NFSR), dengan 14 feedback taps, dan fungsi output non-linear 20 variabel. Namun, keamanan Espresso sehubungan dengan beberapa serangan cryptanalytic standar diperkirakan menggunakan alternatif NFSR, yang hanya memiliki dua feedback taps. Analisis di atas didasarkan pada klaim bahwa alternatif NFSR ini diperoleh menggunakan algoritma transformasi yang mempertahankan urutan output dari NFSR asli.

Machine translation (Meta M2M100); the English original follows.

Abstract

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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