基于相变存储器的非易失内存数据机密性保护

A Scheme for Protecting Confidentiality of No-volatile Main Memory Based on Phase-Change Memory

相变存储器(Phase-Change Memory)是计算机体系结构中的下一代内存技术,具有高密度、低功耗、非易失等优点,具备替代现有DRAM内存的实力,但非易失的自然属性会带来一系列潜在计算机数据隐私方面的隐患.比如掉电后内存中依然保留了很多明文形式的敏感数据,同时相变存储器的存储单元还有写次数有限的问题.文中提出一种基于加密技术和减少相变存储器写次数的方法.它能保护基于相变存储器的内存中的数据,即使在系统断电的状态下内存中的敏感数据也不能被攻击者获取,同时极大延长了系统内存的使用寿命,加强了非易失内存的机密性和可靠性.实验结果表明,增加处理单元后,整体系统性能只下降3.6%,同时在加密操作的条件下相变内存的寿命平均延长2.6倍,所提设计方案可以很好地达到预期目的.

Phase-Change Memory（PCM） is a computer architecture in the next-generation memory technology.As its high density,low power,nonvolatile,etc.,it has ability to replace the existing DRAM memory.But the natural properties of non-volatile computer will bring a range of potential data privacy risks,such as after power-down memory still retains a lot of sensitive data in plain text,and phase-change memory storage unit has issues of limited number writing.Proposed design based on encryption technology and reducing the number of phase-change memory write can protect the data in the phase-change memory,even when the system power off,memory sensitive data can not be obtained by the attacker.While it can greatly extend the life of system memory to enhance the confidentiality and reliability of the non-volatile memory.The results show that increasing the processing unit,the overall system performance is only down 3.6%,while adding the encryption operation on the phase-change memory,the life of whole memory can be extended 2.6 times the average,the proposed design can achieve the desired good.