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High adsorption selectivity of activated carbon and carbon molecular sieve boosting CO_(2)/N_(2) and CH_(4)/N_(2) separation

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Chinese Journal of Chemical Engineering 2024年第3期67卷 282-297页

作者： Siang Chen wenling wu Zhaoyang Niu Deqi Kong Wenbin Li Zhongli Tang Donghui Zhang The Research Center of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Flue gas and coal bed methane are two important sources of greenhouse *** swing adsorption process has a wide range of application in the field of gas separation,and the selection of adsorbent is *** this regard,in order to assess the better adsorbent for separating CO_(2) from flue gas and CH_(4) from coal bed methane,adsorption isotherms of CO_(2),CH_(4) and N_(2) on activated carbon and carbon molecular sieve are measured at 303.15,318.15 and 333.15 K,and up to 250 *** experimental data fit better with Langmuir 2 compared to Langmuir 3 and Langmuir-Freundlich models,and Clausius-Clapeyron equation was used to calculate the isosteric *** the order of the adsorbed amount and the adsorption heat on the two adsorbents are CO_(2)>CH_(4)>N_(2).The adsorption kinetics are calculated by the pseudo-first kinetic model,and the order of adsorption rates on activated carbon is N_(2)-CH_(4)>CO_(2),while on carbon molecular sieve,it is CO_(2)-N_(2)>CH_(4).It is shown that relative molecular mass and adsorption heat are the primary effect on kinetics for activated carbon,while kinetic diameter is the main resistance factor for carbon molecular ***,the adsorption selectivity of CH_(4)/N_(2) and CO_(2)/N_(2) were estimated with the ideal adsorption solution theory,and carbon molecular sieve performed best at 318.15 K for both CO_(2) and CH_(4) *** study suggested that activated carbon is a better choice for separating flue gas and carbon molecular sieve can be a strong candidate for separating coal bed methane.

关键词： Activated carbon Carbon molecular sieve Adsorbent evaluation Adsorption equilibrium and kinetics Heat of adsorption Selectivity

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LOL: a highly flexible framework for designing stream ciphers

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Science China(Information Sciences) 2024年第9期67卷 62-75页

作者： Dengguo FENG Lin JIAO Yonglin HAO Qunxiong ZHENG wenling wu Wenfeng QI Lei ZHANG Liting ZHANG Siwei SUN Tian TIAN State Key Laboratory of Cryptology PLA Strategic Support Force Information Engineering University Institute of Software Chinese Academy of Sciences Westone Cryptologic Research Center School of Cryptology University of Chinese Academy of Sciences

In this paper, we propose LOL, a general framework for designing blockwise stream ciphers. The proposed framework achieves ultrafast software implementations for ubiquitous virtual networks in 5G/6G environments and high-security levels for post-quantum cryptography. The LOL framework is structurally strong; furthermore, this framework and all its components enjoy high flexibility with various extensions. On the basis of the LOL framework, we propose new stream-cipher designs called LOL-MINI and LOL-DOUBLE with the support of the AES-NI and single instruction multiple data instructions. The former applies the basic LOL single mode, while the latter uses the extended parallel-dual mode. LOL-MINI and LOL-DOUBLE support 256-bit key length. Our thorough evaluations revealed that these cipher designs have 256-bit security margins against all existing cryptanalysis methods, including differential, linear, and integral. The software performances of LOL-MINI and LOL-DOUBLE can reach 89 and 135 Gbps. In addition to pure encryptions,the LOL-MINI and LOL-DOUBLE stream ciphers can be applied in a stream-cipher-then-MAC strategy to make AEAD schemes.

关键词： stream cipher 5G/6G mobile system fast software implementation

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Security of Khudra Against Meet-in-the-Middle-Type Cryptanalysis

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Chinese Journal of Electronics 2019年第3期28卷 482-488页

作者： ZHENG Yafei wu wenling TCA Laboratory SKLCS Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences

Khudra is a lightweight block cipher proposed in SPACE 2014. The cipher is designed for Field programmable gate array(FPGA) based platforms. In this paper, we introduce the first biclique attack on full Khudra in the single key setting, with time complexity of 278.3 encryptions. The time complexity can be further reduced if the post-whitening key is omitted. Furthermore, based on the bicliques constructed, Meet-in-the-middle(MITM)attack is applied to 15-round Khudra, and the best result of Khudra in terms of attacked rounds against MITM attack is achieved.

关键词： Khudra Biclique attack Meet-in-theMiddle(MITM) attack Partial match

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Improved Differential and Linear Active S-Boxes Search Techniques for Feistel Type Ciphers

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Chinese Journal of Electronics 2015年第2期24卷 343-348页

作者： ZHANG Lei wu wenling Trusted Computing and Information Assurance Laboratory Institute of Software State Key Laboratory of Computer Science Institute of Software

We propose improved differential and linear active S-boxes search techniques for Feistel type ciphers. We give a uniform representation of Feistel type structures which can benefit the analysis of differential propagation. By analyzing the properties of Feistel type environment, we present some important observations of differential propagation and propose a notion of equivalent state set which can narrow down the search space noticeably. We present a practical algorithm to improve the search of active S-boxes for Feistel type ciphers. It is basically a Viterbi search operating on equivalent state set and also adopts the pruning mechanism. Our experimental results show that the improved algorithm have advantages in respect to memory and time complexities, and it can be applied efficiently to Feistel cipher with large blocks. The search program can be implemented in normal PC, which will be more practical and useful for the designers and cryptanalysts.

关键词： Block cipher Feistel type ciphers Differential and linear active S-boxes Automatic search technique

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表面活性剂在强化疏水性有机污染物土壤修复中的研究与应用进展

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农业环境科学学报 2024年第6期43卷 1220-1229页

作者：吴文伶杨明辉张鹤清王圆生汪磊中建工程产业技术研究院有限公司北京101399 南开大学环境科学与工程学院天津300350 中建环能科技股份有限公司成都610045 天津市博创环保科技有限公司天津300042

疏水性有机污染物(Hydrophobic organic contaminants,HOCs)在土壤环境中分布广泛。由于不易从土壤颗粒中解吸,迁移性和生物有效性低,化学、生物与物理修复技术对土壤中HOCs的修复效果常受到抑制。表面活性剂对HOCs具有增溶能力,常被用... 详细信息

疏水性有机污染物(Hydrophobic organic contaminants,HOCs)在土壤环境中分布广泛。由于不易从土壤颗粒中解吸,迁移性和生物有效性低,化学、生物与物理修复技术对土壤中HOCs的修复效果常受到抑制。表面活性剂对HOCs具有增溶能力,常被用于强化其他修复技术的处理效率。本文对近20年来表面活性剂在强化土壤化学、生物或物理技术修复土壤HOCs污染领域的研究与应用情况进行了分类总结,并比较分析了各类表面活性剂强化技术的适用性及局限性,提出了联合修复技术和表面活性剂泡沫是表面活性剂强化土壤HOCs修复的未来研究方向。

关键词：表面活性剂疏水性有机物土壤修复增溶

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Quantum Differential Collision Distinguishing Attacks on Feistel Schemes

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Chinese Journal of Electronics 2021年第6期30卷 1030-1037页

作者： ZHANG Zhongya wu wenling WANG Bolin Trusted Computing and Information Assurance Laboratory Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences Luoyang Normal University

Feistel schemes are important components of symmetric ciphers, which have been extensively studied in the classical setting. We examine the extension methods of differential distinguishers of Feistel key-function and Feistel function-key schemes. The schemes are subjected to quantum differential collision distinguishing attacks based on the methods. The results show that the complexity is lower than that of differential attacks using only Grover algorithm, and the complexity of differential collision attack based on the Brassard-H?yer-Tapp and Grover algorithms is lower than that of quantization when using only the Grover algorithm. The results also show that different algorithms and methods can be combined to produce a more effective cryptanalysis approach. This provides a research direction for postquantum cryptographic analysis and design.

关键词： Quantum cryptography Cryptography Cryptography theory Data security Quantum computing Block cipher Feistel scheme Differential attacks Distinguishing attacks

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Diffusion and Security Evaluation of Feistel-PG

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Chinese Journal of Electronics 2017年第4期26卷 734-739页

作者： WANG Yanfeng wu wenling ZHANG Lei Trusted Computing and Information Assurance Laboratory Institute of Software Graduate University of Chinese Academy of Sciences State Key Laboratory of Computer Science Institute of Software

Feistel-PG structure is a new specific Generalized Feistel structure(GFS) adopted in DBlock and LHash. Its main feature is adding a sbox-size permutation before the round function. Different choices of the permutation may affect the security property of ciphers with Feistel-PG structure but how it effects is not clear. We evaluate the values of diffusion round for all possible parameters and summarize the characteristics of optimum shuffles. The results show that one special kind of FeistelPG achieves full diffusion in less cost than the improved GFS. This advantage may attract the designers’ interests and this kind of Feistel-PG ciphers are suggested to designers. We also evaluate the security of suggested ciphers against various byte-oriented attacks, including differential cryptanalysis, linear cryptanalysis, impossible differential attack and integral attack. Some permutations with optimum diffusion but relatively weaker security are filtered out and these permutations should be avoided by designers.

关键词： Block cipher Diffusion Cryptanalysis GFS Feistel-PG

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The DBlock family of block ciphers

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Science China(Information Sciences) 2015年第3期58卷 91-104页

作者： wu wenling ZHANG Lei YU XiaoLi Trusted Computing and Information Assurance Laboratory Institute of SoftwareChinese Academy of Sciences State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences

In this paper,we propose a new family of block ciphers named *** consists of three variants which are specified as DBlock-128,DBlock-192,and DBlock-256,***-n has the equal n-bit block length and key *** structure of DBlock successfully combines the advantages of Feistel and Type-2generalized Feistel structures ***,its design of round function employs different linear transforms operating on various word-sizes,which efficiently improve the diffusion *** key schedule of DBlock,it basically employs the same module used in encryption,except the choice of different byte permutations,which can improve its suitability for various implementation environments and also enhance its security against many cryptanalytic *** preliminary evaluation shows that DBlock can achieve enough security margin against known attacks,and it can also obtain excellent performances on various software and hardware platforms.

关键词： block cipher structure round function key scheduling security performance

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Known-key distinguishers on type-1 Feistel scheme and near-collision attacks on its hashing modes

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Frontiers of Computer Science 2014年第3期8卷 513-525页

作者： Le DONG wenling wu Shuang wu Jian ZOU College of Mathematics and Information Science Henan Normal University Xinxiang 453007 China Institute of Software Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100149 China

We present some known-key distinguishers for a type-1 Feistel scheme with a permutation as the round function. To be more specific, the 29-round known-key truncated differential distinguishers are given for the 256-bit type-1 Feistel scheme with an SP （substitution-permutation） round function by using the rebound attack, where the S-boxes have perfect differential and linear properties and the linear diffusion layer has a maximum branch number. For two 128-bit versions, the distinguishers can be applied on 25- round structures. Based on these distinguishers, we construct near-collision attacks on these schemes with MMO （Matyas- Meyer-Oseas） and MP （Miyaguchi-Preneel） hashing modes, and propose the 26-round and 22-round near-collision attacks for two 256-bit schemes and two 128-bit schemes, respectively. We apply the near-collision attack on MAME and obtain a 26-round near-collision attack. Using the algebraic degree and some integral properties, we prove the correctness of the 31-round known-key integral distinguisher proposed by Sasaki et al. We show that if the round function is a permutation, the integral distinguisher is suitable for a type-1 Feistel scheme of any size.

关键词： known-key block cipher generalized Feistel scheme type-1 rebound attack integral distinguisher algebraic degree

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Improved Fault Attack on LBlock: Earlier Injection with No Extra Faults

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Chinese Journal of Electronics 2017年第4期26卷 754-759页

作者： GAO Si CHEN Hua FAN Limin wu wenling Trusted Computing and Information Assurance Laboratory Institute of Software Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

As one of the most popular lightweight ciphers in recent years, LBlock has attracted great *** have explored the security of LBlock against various attacks. We focus on fault attack—one of the most important implementation attacks. In the past two years,fault attacks under the random fault model have been successfully applied to LBlock, supposing faults were injected at the end of the 24 th to the 31 st round. If faults are injected at the end of the 23 rd round, previous attacks only work under the semi-random fault model. For the first time, we address this issue and propose a 23 rd round fault attack under the random fault model. Compared with the previous works, our attack extends the fault injection to earlier round, with reasonable time cost and no extra faults. Experiments show that it only takes 10 faults to recover the secret key.

关键词： Implementation analysis Fault analysis Random fault model

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