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Quantum cryptanalysis on some generalized Feistel schemes

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Science China(Information Sciences) 2019年第2期62卷 180-191页

作者： xiaoyang dong Zheng LI Xiaoyun WANG Institute for Advanced Study Tsinghua University Key Laboratory of Cryptologic Technology and Information Security Ministry of EducationShandong University

Post-quantum cryptography has attracted much attention from worldwide cryptologists. In ISIT 2010, Kuwakado and Morii gave a quantum distinguisher with polynomial time against 3-round Feistel networks. However, generalized Feistel schemes(GFS) have not been systematically investigated against quantum attacks. In this paper, we study the quantum distinguishers about some generalized Feistel *** d-branch Type-1 GFS(CAST256-like Feistel structure), we introduce(2 d-1)-round quantum distinguishers with polynomial time. For 2 d-branch Type-2 GFS(RC6/CLEFIA-like Feistel structure), we give(2 d + 1)-round quantum distinguishers with polynomial time. Classically, Moriai and Vaudenay proved that a 7-round 4-branch Type-1 GFS and 5-round 4-branch Type-2 GFS are secure pseudo-random permutations. Obviously, they are no longer secure in quantum setting. Using the above quantum distinguishers, we introduce generic quantum key-recovery attacks by applying the combination of Simon’s and Grover’s algorithms recently proposed by Leander and May. We denote n as the bit length of a branch. For(d2-d + 2)-round Type-1 GFS with d branches, the time complexity is 2((1/2d2-3/2d+2)·n/2), which is better than the quantum brute force search(Grover search) by a factor 2((1/4d2+1/4d)n). For 4 d-round Type-2 GFS with d2 branches, the time complexity is 2((d2n)/2(, which is better than the quantum brute force search by a factor 2((3d2n)/2).

关键词： generalized Feistel schemes Simon Grover quantum key-recovery quantum cryptanalysis

Impossible differential attack on Simpira v2

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Science China(Information Sciences) 2018年第3期61卷 71-83页

作者： Rui ZONG xiaoyang dong Xiaoyun WANG Key Laboratory of Cryptologic Technology and Information Security Ministry of EducationShandong University Institute for Advanced Study Tsinghua University

Simpira v2 is a family of cryptographic permutations proposed at ASIACRYPT 2016, and can be used to construct high throughput block ciphers by using the Even-Mansour construction, permutationbased hashing, and wide-block authenticated encryption. This paper shows a 9-round impossible differential of Simpira-4. To the best of our knowledge, this is the first 9-round impossible differential. To determine some efficient key recovery attacks on its block cipher mode（Even-Mansour construction with Simpira-4）,we use some 6/7-round shrunken impossible differentials. Based on eight 6-round impossible differentials, we propose a series of 7-round key recovery attacks on the block cipher mode; each 6-round impossible differential helps recover 32 bits of the master key（512 bits）, and in total, half of the master key bits are *** attacks require 257 chosen plaintexts and 2577-round encryptions. Furthermore, based on ten 7-round impossible differentials, we add one round on the top or at the bottom to mount ten 8-round key recovery attacks on the block cipher mode. This helps recover the full key space（512 bits） with a data complexity of 2;chosen plaintexts and time complexity of 21708-round encryptions. Those are the first attacks on the round-reduced Simpira v2 and do not threaten the Even-Mansour mode with the full 15-round Simpira-4.

关键词： Simpira-4 impossible differential attack super S-box the Even-Mansour construction security claim

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Science China(Information Sciences) 2019年第3期62卷 19-30页

Deoxys-BC is the internal tweakable block cipher of Deoxys, a third-round authenticated encryption candidate at the CAESAR competition. In this study, by adequately studying the tweakey schedule,we seek a six-round related-tweakey impossible distinguisher of Deoxys-BC-256, which is transformed from a3.5-round single-key impossible distinguisher of AES, by application of the mixed integer linear programming(MILP) method. We present a detailed description of this interesting transformation method and the MILPmodeling process. Based on this distinguisher, we mount a key-recovery attack on 10(out of 14) rounds of Deoxys-BC-256. Compared to previous results that are valid only when the key size > 204 and the tweak size < 52, our method can attack 10-round Deoxys-BC-256 as long as the key size 174 and the tweak size 82. For the popular setting in which the key size is 192 bits, we can attack one round more than previous studies. Note that this paper only gives a more accurate security evaluation and does not threaten the security of full-round Deoxys-BC-256.

关键词： related-tweakey impossible di?erential attack tweakable block cipher Deoxys-BC-256 tweakey schedule MILP

Key-dependent cube attack on reduced Frit permutation in Duplex-AE modes

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Science China(Information Sciences) 2021年第3期64卷 226-228页

作者： Lingyue QIN xiaoyang dong Keting JIA Rui ZONG Institute for Advanced Study Tsinghua University Department of Computer Science and Technology Tsinghua University

Dear editor,Recently, the permutation-based cryptology becomes a good topic in symmetric-key research groups. Many dedicated ciphers are permutation-based, and researchers introduced lots of cryptographic permutations which were suitable for different applications(collision-resistant hashing, preimageresistant hashing, message authentication, message encryption, etc.). Frit(fault-resistant iterative transformation) is a new lightweight 384-bit cryptographic permutation proposed by Simon et al.

关键词： Frit Duplex authenticated encryption mode Key-dependent cube attack Key-recovery Permutation-based cryptology

Analysis and Modeling of Time Output Characteristics for Distributed Photovoltaic and Energy Storage

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Energy Engineering 2024年第4期121卷 933-949页

作者： Kaicheng Liu Chen Liang xiaoyang dong Liping Liu China Electric Power Research Institute Beijing100192China Electric Power Research Institute State Grid Gansu Electric Power CompanyLanzhou730000China State Key Laboratory of Power Grid Safety Beijing100084China

Due to the unpredictable output characteristics of distributed photovoltaics,their integration into the grid can lead to voltage fluctuations within the regional power ***,the development of spatial-temporal coordination and optimization control methods for distributed photovoltaics and energy storage systems is of utmost importance in various *** paper approaches the issue from the perspective of spatiotemporal forecasting of distributed photovoltaic(PV)generation and proposes a Temporal Convolutional-Long Short-Term Memory prediction model that combines Temporal Convolutional Networks(TCN)and Long Short-Term Memory(LSTM).To begin with,an analysis of the spatiotemporal distribution patterns of PV generation is conducted,and outlier data is handled using the 3σ ***,a novel approach that combines temporal convolution and LSTM networks is introduced,with TCN extracting spatial features and LSTM capturing temporal ***,a real spatiotemporal dataset from Gansu,China,is established to compare the performance of the proposed network against other *** results demonstrate that the model presented in this paper exhibits the highest predictive accuracy,with a single-step Mean Absolute Error(MAE)of 1.782 and an average Root Mean Square Error(RMSE)of 3.72 for multi-step predictions.

关键词： Photovoltaic power generation spatio-temporal prediction temporal convolutional network long short-term memory network

Energy Economic Dispatch for Photovoltaic-Storage via Distributed Event-Triggered Surplus Algorithm

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Energy Engineering 2024年第9期121卷 2621-2637页

作者： Kaicheng Liu Chen Liang Naiyue Wu xiaoyang dong Hui Yu China Electric Power Research Institute Beijing100192China Electric Power Research Institute of State Grid Gansu Electric Power Company Lanzhou730000China State Key Laboratory of Power Grid Safety Beijing100084China

This paper presents a novel approach to economic dispatch in smart grids equipped with diverse energy *** method integrates features including photovoltaic(PV)systems,energy storage coupling,varied energy roles,and energy supply and demand *** systemmodel is developed by considering energy devices as versatile units capable of fulfilling various functionalities and playing multiple roles *** strike a balance between optimality and feasibility,renewable energy resources are modeled with considerations for forecasting errors,Gaussian distribution,and penalty ***,this study introduces a distributed event-triggered surplus algorithm designed to address the economic dispatch problem by minimizing production *** in surplus theory and finite time projection,the algorithm effectively rectifies network imbalances caused by directed graphs and addresses local inequality *** algorithm greatly reduces the communication burden through event triggering ***,both theoretical proofs and numerical simulations verify the convergence and event-triggered nature of the algorithm.

关键词： Fully distributed algorithm economic dispatch directed graph renewable energy resource

Strategic Adjustments and Countermeasures of Central Asian Countries against Extremist Forces

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China International Studies 2007年第2期27卷 97-120页

作者： dong xiaoyang Su Chang Deputy Director General of the Institute of Russian/East European and Central Asian Studies of Chinese Academy of Social Sciences Assistant Professor at the Institute of Russian/East European and Central Asian＇Studies CASS.

All Central Asian countries have made stragetic adjustments after the 9/11 incident. First, with their traditional strategy

关键词：中亚地区国家极端主义者武装策略调整

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改进的Type-1型广义Feistel结构的量子攻击及其在分组密码CAST-256上的应用

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电子与信息学报 2020年第2期42卷 295-306页

作者：倪博煜董晓阳山东大学密码技术与信息安全教育部重点实验室济南250100 山东大学网络空间安全学院青岛266237 清华大学高等研究院北京100084

广义Feistel结构(GFS)是设计对称密码算法的重要基础结构之一,其在经典计算环境中受到了广泛的研究。但是,量子计算环境下对GFS的安全性评估还相当稀少。该文在量子选择明文攻击(qCPA)条件下和量子选择密文攻击(qCCA)条件下,分别对Type-... 详细信息

广义Feistel结构(GFS)是设计对称密码算法的重要基础结构之一,其在经典计算环境中受到了广泛的研究。但是,量子计算环境下对GFS的安全性评估还相当稀少。该文在量子选择明文攻击(qCPA)条件下和量子选择密文攻击(qCCA)条件下,分别对Type-1 GFS进行研究,给出了改进的多项式时间量子区分器。在qCPA条件下,给出了3d–3轮的多项式时间量子区分攻击,其中d(d≥3)是Type-1 GFS的分支数,攻击轮数较之前最优结果增加d-2轮。得到更好的量子密钥恢复攻击,即相同轮数下攻击的时间复杂度降低了2(d-2)n/2。在qCCA条件下,对于Type-1 GFS给出了3d-2轮的多项式时间量子区分攻击,比之前最优结果增加了d-1轮。该文将上述区分攻击应用到CAST-256分组密码中,得到了12轮qCPA多项式时间量子区分器,以及13轮qCCA多项式时间量子区分器,该文给出19轮CAST-256的量子密钥恢复攻击。

关键词：分组密码广义Feistel结构量子攻击 CAST-256加密算法

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村社意识与俄罗斯社会发展

俄罗斯东欧中亚研究 2002年第6期 13-17+97页

作者：董晓阳中国社会科学院东欧中亚研究所

在俄国的农民共耕社这种共有制生产方式下形成的思维定式 ,即使在村社消失后 ,仍对人们的观念和社会的发展有潜移默化的影响 ,它与俄罗斯的改革以及新世纪的走向也有一定的关联。在西方观念引进的同时 ,村社思维方式在 2 1世纪仍然对社... 详细信息

在俄国的农民共耕社这种共有制生产方式下形成的思维定式 ,即使在村社消失后 ,仍对人们的观念和社会的发展有潜移默化的影响 ,它与俄罗斯的改革以及新世纪的走向也有一定的关联。在西方观念引进的同时 ,村社思维方式在 2 1世纪仍然对社会发展有一定的影响 ,这可能会形成两种思维方式的撞击 ,而形成新的俄罗斯思维方式 ,俄罗斯在 2 1世纪的发展在一定程度上取决于这样的新思维方式。

关键词：俄罗斯村社普京社会发展