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
ストリーム暗号機EspressoはE. DubrovaとM. Hellが5Gセキュリティのハードウェア効率的な候補者として設計したもので、256ビットのバイナリ非線形フィードバックシフトレジストリ(NFSR)と14のフィードバックタップ、20の変数非線形出力機能の2つのコンポーネントがありますが、いくつかの標準的な暗号分析攻撃に関してEspressoのセキュリティは、オリジナルのNFSRの出力順序を保持する変換アルゴリズムを使用してこの代替NFSRが得られるという主張に基づいています。
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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