Cloud computing is deemed the next-generation information technology(IT) platform, in which a data center is crucial for providing a large amount of computing and storage resources for various service applications wit...Cloud computing is deemed the next-generation information technology(IT) platform, in which a data center is crucial for providing a large amount of computing and storage resources for various service applications with high quality guaranteed. However, cloud users no longer possess their data in a local data storage infrastructure,which would result in auditing for the integrity of outsourced data being a challenging problem, especially for users with constrained computing resources. Therefore, how to help the users complete the verification of the integrity of the outsourced data has become a key issue. Public verification is a critical technique to solve this problem, from which the users can resort to a third-party auditor(TPA) to check the integrity of outsourced data. Moreover,an identity-based(ID-based) public key cryptosystem would be an efficient key management scheme for certificatebased public key setting. In this paper, we combine ID-based aggregate signature and public verification to construct the protocol of provable data integrity. With the proposed mechanism, the TPA not only verifies the integrity of outsourced data on behalf of cloud users, but also alleviates the burden of checking tasks with the help of users' identity. Compared to previous research, the proposed scheme greatly reduces the time of auditing a single task on the TPA side. Security analysis and performance evaluation results show the high efficiency and security of the proposed scheme.展开更多
对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个...对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个层次出发,提出了一种基于USB Key启动、动态口令手机令牌和EFI安全防护软件的三层安全加固的方案。将EFI OS Loader文件存放在USB Key中并加密,实现对文件的保护;把动态口令认证服务端置于USB Key中,两者的有机结合实现了高强度的开机身份认证;设计并开发了遵循UEFI规范的EFI应用程序型安全防护软件,实现了对系统关键区域的保护。实验结果表明,该方案的双认证与安全防护机制弥补了相关安全漏洞,增强了计算机系统启动过程的安全性。展开更多
云存储系统为用户提供大容量、高访问效率、价格合理的存储服务.然而,使用云存储服务的用户,一旦将文件上传至CSP(cloud server provider),便失去了数据的绝对控制权.众所周知,CSP并不可靠.因此,云上存储的数据是否完整,成为值得深入探...云存储系统为用户提供大容量、高访问效率、价格合理的存储服务.然而,使用云存储服务的用户,一旦将文件上传至CSP(cloud server provider),便失去了数据的绝对控制权.众所周知,CSP并不可靠.因此,云上存储的数据是否完整,成为值得深入探讨的问题.在公共云存储环境中,将公司、机构或组织定义为一个组,组内由负责人进行管理.组内用户为便于使用云存储服务,可借助于组负责人进行统一操作.这种场景下,为解决位于同一组内的用户数据完整性验证问题,提出了一个组用户数据完整性验证方案.为协助组内用户进行一系列操作,方案提出了代理这一实体.方案基于IBE(identity-based encryption)进行标签的设计,摆脱了复杂的证书管理问题.在数据完整性验证阶段,通过采用随机抽样的方式,减少了系统的性能开销.借助于随机预言机模型,该方案被证明是安全的.且通过的一系列的性能分析与评估,验证了该方案是可行的.展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.60933005 and 91124002)the National High-Tech R&D Program(863)of China(Nos.2010AA012505,2011AA010702,2012AA01A401,and 2012AA01A402)+1 种基金the National 242 Foundation(No.2011A010)the National Technology Support Foundation(Nos.2012BAH38B04 and 2012BAH38B06)
文摘Cloud computing is deemed the next-generation information technology(IT) platform, in which a data center is crucial for providing a large amount of computing and storage resources for various service applications with high quality guaranteed. However, cloud users no longer possess their data in a local data storage infrastructure,which would result in auditing for the integrity of outsourced data being a challenging problem, especially for users with constrained computing resources. Therefore, how to help the users complete the verification of the integrity of the outsourced data has become a key issue. Public verification is a critical technique to solve this problem, from which the users can resort to a third-party auditor(TPA) to check the integrity of outsourced data. Moreover,an identity-based(ID-based) public key cryptosystem would be an efficient key management scheme for certificatebased public key setting. In this paper, we combine ID-based aggregate signature and public verification to construct the protocol of provable data integrity. With the proposed mechanism, the TPA not only verifies the integrity of outsourced data on behalf of cloud users, but also alleviates the burden of checking tasks with the help of users' identity. Compared to previous research, the proposed scheme greatly reduces the time of auditing a single task on the TPA side. Security analysis and performance evaluation results show the high efficiency and security of the proposed scheme.
文摘对统一可扩展固件接口(UEFI)的体系架构和执行流程进行安全性分析,发现Windows启动过程中EFI OS Loader的可信性校验存在安全漏洞,其可导致Windows启动流程被劫持。针对该安全漏洞,从文件分离保护、开机身份认证和系统关键区域防护3个层次出发,提出了一种基于USB Key启动、动态口令手机令牌和EFI安全防护软件的三层安全加固的方案。将EFI OS Loader文件存放在USB Key中并加密,实现对文件的保护;把动态口令认证服务端置于USB Key中,两者的有机结合实现了高强度的开机身份认证;设计并开发了遵循UEFI规范的EFI应用程序型安全防护软件,实现了对系统关键区域的保护。实验结果表明,该方案的双认证与安全防护机制弥补了相关安全漏洞,增强了计算机系统启动过程的安全性。
文摘云存储系统为用户提供大容量、高访问效率、价格合理的存储服务.然而,使用云存储服务的用户,一旦将文件上传至CSP(cloud server provider),便失去了数据的绝对控制权.众所周知,CSP并不可靠.因此,云上存储的数据是否完整,成为值得深入探讨的问题.在公共云存储环境中,将公司、机构或组织定义为一个组,组内由负责人进行管理.组内用户为便于使用云存储服务,可借助于组负责人进行统一操作.这种场景下,为解决位于同一组内的用户数据完整性验证问题,提出了一个组用户数据完整性验证方案.为协助组内用户进行一系列操作,方案提出了代理这一实体.方案基于IBE(identity-based encryption)进行标签的设计,摆脱了复杂的证书管理问题.在数据完整性验证阶段,通过采用随机抽样的方式,减少了系统的性能开销.借助于随机预言机模型,该方案被证明是安全的.且通过的一系列的性能分析与评估,验证了该方案是可行的.
