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
스트림 암호화기 Espresso는 E. Dubrova와 M. Hell에 의해 하드웨어 효율적인 5G 보안 후보로 설계되었습니다. 그것에는 256 비트 바이너리 비선형 피드백 전환 레지스트리 (NFSR)와 14 개의 피드백 탭과 20 개의 변수 비선형 출력 기능이 포함된 두 가지 구성 요소가 있습니다. 그러나 몇 가지 표준 암호 분석 공격과 관련하여 Espresso의 보안은 대체 NFSR를 사용하여 추정됩니다. 위의 분석은이 대체 NFSR가 원래 NFSR의 출력 순서를 보존하는 변환 알고리즘을 사용하여 얻은 것이라고 주장합니다.
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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