The majority of published empirical correlations and mechanistic models are unable to provide accurate flowing bottom-hole pressure(FBHP)predictions when real-time field well data are used.This is because the empirica...The majority of published empirical correlations and mechanistic models are unable to provide accurate flowing bottom-hole pressure(FBHP)predictions when real-time field well data are used.This is because the empirical correlations and the empirical closure correlations for the mechanistic models were developed with experimental datasets.In addition,most machine learning(ML)FBHP prediction models were constructed with real-time well data points and published without any visible mathematical equation.This makes it difficult for other readers to use these ML models since the datasets used in their development are not open-source.This study presents a white-box adaptive neuro-fuzzy inference system(ANFIS)model for real-time prediction of multiphase FBHP in wellbores.1001 real well data points and 1001 normalized well data points were used in constructing twenty-eight different Takagi eSugeno fuzzy inference systems(FIS)structures.The dataset was divided into two sets;80%for training and 20%for testing.Statistical performance analysis showed that a FIS with a 0.3 range of influence and trained with a normalized dataset achieved the best FBHP prediction performance.The optimal ANFIS black-box model was then translated into the ANFIS white-box model with the Gaussian input and the linear output membership functions and the extracted tuned premise and consequence parameter sets.Trend analysis revealed that the novel ANFIS model correctly simulates the anticipated effect of input parameters on FBHP.In addition,graphical and statistical error analyses revealed that the novel ANFIS model performed better than published mechanistic models,empirical correlations,and machine learning models.New training datasets covering wider input parameter ranges should be added to the original training dataset to improve the model's range of applicability and accuracy.展开更多
White-box cryptography is critical in a communication system to protect the secret key from being disclosed in a cryptographic algorithm code implementation.The stream cipher is a main dataflow encryption approach in ...White-box cryptography is critical in a communication system to protect the secret key from being disclosed in a cryptographic algorithm code implementation.The stream cipher is a main dataflow encryption approach in mobile communication.However,research work on white-box cryptographic implementation for stream cipher is rare.A new white-box Zu Chongzhi-128(ZUC-128)cryptographic implementation algorithm named WBZUC was proposed.WBZUC adopts lookup table and random coding in the non-linear function to make the intermediate value chaotic without changing the final encryption result.Thus,the WBZUC algorithm’s security gets improved compared with the original ZUC-128 algorithm.As for the efficiency,a test experiment on WBZUC shows that the average speed of key generation,encryption,and decryption can reach at 33.74 kbit/s,23.31 kbit/s,24.06 kbit/s respectively.Despite its running speed is relatively a bit lower than original ZUC-128 algorithm,WBZUC can provide better security and comprehensive performance in mobile communication system environment.展开更多
Digital rights management(DRM) applications are usually confronted with threats like key extraction, code lifting, and illegal distribution. White-box cryptography aims at protecting software implementations of crypto...Digital rights management(DRM) applications are usually confronted with threats like key extraction, code lifting, and illegal distribution. White-box cryptography aims at protecting software implementations of cryptographic algorithms and can be employed into DRM applications to provide security. A general DRM solution based on white-box cryptography was proposed to address the three threats mentioned above. The method is to construct a general perturbation-enabled white-box compiler for lookup-table based white-box block ciphers, such that the white-box program generated by this compiler provides traceability along with resistance against key extraction and code lifting. To get a traceable white-box program, the idea of hiding a slight perturbation in the lookup-table was employed, aiming at perturbing its decryption functionality, so that each user can be identified. Security analysis and experimental results show that the proposed DRM solution is secure and practical.展开更多
The white-box attack is a new attack context in which it is assumed that cryptographic software is implemented on an un-trusted platform and all the implementation details are controlled by the attackers. So far, almo...The white-box attack is a new attack context in which it is assumed that cryptographic software is implemented on an un-trusted platform and all the implementation details are controlled by the attackers. So far, almost all white-box solutions have been broken. In this study, we propose a white-box encryption scheme that is not a variant of obfuscating existing ciphers but a completely new solution. The new scheme is based on the unbalanced Feistel network as well as the ASASASA （where ＂A＂ means affine, and ＂S＂ means substitution） structure. It has an optional input block size and is suitable for saving space compared with other solutions because the space requirement grows slowly （linearly） with the growth of block size. Moreover, our scheme not only has huge white-box diversity and white-box ambiguity but also has a particular construction to bypass public white-box cryptanalysis techniques, including attacks aimed at white-box variants of existing ciphers and attacks specific to the ASASASA structure. More precisely, we present a definition of white-box security with regard to equivalent key, and prove that our scheme satisfies such security requirement.展开更多
文章重点阐述信息与通信技术(Information and Communications Technology,ICT)基础设施监控系统存在的问题,如监控系统软硬件高度耦合、数据无法共享等,严重影响了监控系统的集约化管理、智能运营和运维等工作的开展。为解决这些问题,...文章重点阐述信息与通信技术(Information and Communications Technology,ICT)基础设施监控系统存在的问题,如监控系统软硬件高度耦合、数据无法共享等,严重影响了监控系统的集约化管理、智能运营和运维等工作的开展。为解决这些问题,提出了底端采集硬件白盒化、监控单元B接口和系统间C接口标准化等方案,以确保ICT基础设施实现集约化管理和智慧运营。展开更多
白盒模型下密码分析者被授权可以完全访问加密软件实现的中间过程.为了解决现有白盒密码通信中密钥生成方式固定、安全性不足的问题,构造了动态白盒库,设计了改进的SM4动态白盒密码算法WBDL(white-box SM4 algorithm based on dynamic w...白盒模型下密码分析者被授权可以完全访问加密软件实现的中间过程.为了解决现有白盒密码通信中密钥生成方式固定、安全性不足的问题,构造了动态白盒库,设计了改进的SM4动态白盒密码算法WBDL(white-box SM4 algorithm based on dynamic white-box library).算法设计中应用新的查找表理论,构造了非固定的动态白盒库,把SM4算法的轮函数分割成三个阶段,再进行置乱编码,然后将密钥信息隐藏在第二阶段的查找表中以保护密钥.以设计的WBDL算法为基础构造了白盒加密通信软件系统,能够完成即时通讯、文件加解密、定期更换加密密钥等功能,可以在数据安全传输过程中实现对文件及密钥的有效保护.测试结果表明算法平均加密速率为0.273×10^(−3) Gbps,平均解密速率为0.234×10^(−3) Gbps,占用空间仅为尚-白盒算法的3%,但运算效率却更高;所设计的白盒加密通信软件对文件进行加解密的速度相近,平均值约为0.26 Mbps;文件加密传输速度均值为0.95 Mbps;软件系统的平均响应时间为425 ms.展开更多
2002年,CHOW等人根据数字版权管理(Digital Rights Management,DRM)应用场景定义了白盒攻击环境的概念,并将其模型化为一种极端的攻击模型,即白盒模型。白盒模型颠覆了以往攻击模型中对攻击者能力的诸多限制,从软件保护角度考虑,攻击者...2002年,CHOW等人根据数字版权管理(Digital Rights Management,DRM)应用场景定义了白盒攻击环境的概念,并将其模型化为一种极端的攻击模型,即白盒模型。白盒模型颠覆了以往攻击模型中对攻击者能力的诸多限制,从软件保护角度考虑,攻击者被认为拥有对目标软件及其执行的完全控制权。因此,在白盒模型中,数字版权管理系统中的设备,如智能卡、机顶盒等都存在被攻击者篡改的可能。文章基于CLEFIA算法的白盒实现方案,为数字版权管理系统提供一种软件防篡改方案。该方案将软件的二进制代码文件所解释的查找表隐藏在CLEFIA算法的白盒实现方案的查找表集合中,使软件的防篡改安全性与CLEFIA算法的白盒实现方案的加解密正确性结合在一起。一旦软件发生篡改,CLEFIA算法的白盒实现方案的加解密结果将产生错误。CLEFIA算法白盒实现方案的明密文对也将发生变化,而攻击者很难对其进行修复。展开更多
文摘The majority of published empirical correlations and mechanistic models are unable to provide accurate flowing bottom-hole pressure(FBHP)predictions when real-time field well data are used.This is because the empirical correlations and the empirical closure correlations for the mechanistic models were developed with experimental datasets.In addition,most machine learning(ML)FBHP prediction models were constructed with real-time well data points and published without any visible mathematical equation.This makes it difficult for other readers to use these ML models since the datasets used in their development are not open-source.This study presents a white-box adaptive neuro-fuzzy inference system(ANFIS)model for real-time prediction of multiphase FBHP in wellbores.1001 real well data points and 1001 normalized well data points were used in constructing twenty-eight different Takagi eSugeno fuzzy inference systems(FIS)structures.The dataset was divided into two sets;80%for training and 20%for testing.Statistical performance analysis showed that a FIS with a 0.3 range of influence and trained with a normalized dataset achieved the best FBHP prediction performance.The optimal ANFIS black-box model was then translated into the ANFIS white-box model with the Gaussian input and the linear output membership functions and the extracted tuned premise and consequence parameter sets.Trend analysis revealed that the novel ANFIS model correctly simulates the anticipated effect of input parameters on FBHP.In addition,graphical and statistical error analyses revealed that the novel ANFIS model performed better than published mechanistic models,empirical correlations,and machine learning models.New training datasets covering wider input parameter ranges should be added to the original training dataset to improve the model's range of applicability and accuracy.
基金supported by the Beijing Natural Science Foundation(4232034)the Fundamental Research Funds for the Central Universities(328202222)the“Communication Engineering”and“Electronic Information Engineering”National First-Class Undergraduate Major Construction Project。
文摘White-box cryptography is critical in a communication system to protect the secret key from being disclosed in a cryptographic algorithm code implementation.The stream cipher is a main dataflow encryption approach in mobile communication.However,research work on white-box cryptographic implementation for stream cipher is rare.A new white-box Zu Chongzhi-128(ZUC-128)cryptographic implementation algorithm named WBZUC was proposed.WBZUC adopts lookup table and random coding in the non-linear function to make the intermediate value chaotic without changing the final encryption result.Thus,the WBZUC algorithm’s security gets improved compared with the original ZUC-128 algorithm.As for the efficiency,a test experiment on WBZUC shows that the average speed of key generation,encryption,and decryption can reach at 33.74 kbit/s,23.31 kbit/s,24.06 kbit/s respectively.Despite its running speed is relatively a bit lower than original ZUC-128 algorithm,WBZUC can provide better security and comprehensive performance in mobile communication system environment.
基金supported by the National Key Research and Development Program of China (2017YFB0802000)the National Natural Science Foundations of China (61672412,61972457)the National Cryptography Development Fund of China (MMJJ20170104, MMJJ20180219)。
文摘Digital rights management(DRM) applications are usually confronted with threats like key extraction, code lifting, and illegal distribution. White-box cryptography aims at protecting software implementations of cryptographic algorithms and can be employed into DRM applications to provide security. A general DRM solution based on white-box cryptography was proposed to address the three threats mentioned above. The method is to construct a general perturbation-enabled white-box compiler for lookup-table based white-box block ciphers, such that the white-box program generated by this compiler provides traceability along with resistance against key extraction and code lifting. To get a traceable white-box program, the idea of hiding a slight perturbation in the lookup-table was employed, aiming at perturbing its decryption functionality, so that each user can be identified. Security analysis and experimental results show that the proposed DRM solution is secure and practical.
基金This work was supported by the National Natural Science Foundation of China under Grant Nos. 61272440, 61472251, and U1536101, and China Postdoctoral Science Foundation under Grant Nos. 2013M531174 and 2014T70417.
文摘The white-box attack is a new attack context in which it is assumed that cryptographic software is implemented on an un-trusted platform and all the implementation details are controlled by the attackers. So far, almost all white-box solutions have been broken. In this study, we propose a white-box encryption scheme that is not a variant of obfuscating existing ciphers but a completely new solution. The new scheme is based on the unbalanced Feistel network as well as the ASASASA （where ＂A＂ means affine, and ＂S＂ means substitution） structure. It has an optional input block size and is suitable for saving space compared with other solutions because the space requirement grows slowly （linearly） with the growth of block size. Moreover, our scheme not only has huge white-box diversity and white-box ambiguity but also has a particular construction to bypass public white-box cryptanalysis techniques, including attacks aimed at white-box variants of existing ciphers and attacks specific to the ASASASA structure. More precisely, we present a definition of white-box security with regard to equivalent key, and prove that our scheme satisfies such security requirement.
文摘文章重点阐述信息与通信技术(Information and Communications Technology,ICT)基础设施监控系统存在的问题,如监控系统软硬件高度耦合、数据无法共享等,严重影响了监控系统的集约化管理、智能运营和运维等工作的开展。为解决这些问题,提出了底端采集硬件白盒化、监控单元B接口和系统间C接口标准化等方案,以确保ICT基础设施实现集约化管理和智慧运营。
文摘2002年,CHOW等人根据数字版权管理(Digital Rights Management,DRM)应用场景定义了白盒攻击环境的概念,并将其模型化为一种极端的攻击模型,即白盒模型。白盒模型颠覆了以往攻击模型中对攻击者能力的诸多限制,从软件保护角度考虑,攻击者被认为拥有对目标软件及其执行的完全控制权。因此,在白盒模型中,数字版权管理系统中的设备,如智能卡、机顶盒等都存在被攻击者篡改的可能。文章基于CLEFIA算法的白盒实现方案,为数字版权管理系统提供一种软件防篡改方案。该方案将软件的二进制代码文件所解释的查找表隐藏在CLEFIA算法的白盒实现方案的查找表集合中,使软件的防篡改安全性与CLEFIA算法的白盒实现方案的加解密正确性结合在一起。一旦软件发生篡改,CLEFIA算法的白盒实现方案的加解密结果将产生错误。CLEFIA算法白盒实现方案的明密文对也将发生变化,而攻击者很难对其进行修复。
