基于加乘同态与组合函数技术的MA保护研究

Research of MA Protection Based on Addition-multiplication Homomorphism and Composite Function Technology

针对移动代理在异质网络环境中的安全问题,提出一种基于加乘同态与组合函数加密策略的MA保护方案,同态思想应用于移动密码学中,不用解密即可使加密任务代理在其它网络平台上运行.该方案在同态的基础上引入了加乘同态加密策略,采用了加乘同态加密三地址码操作数,组合函数加密三地址码操作码的加密步骤,并在加密后排除了由加乘同态与组合函数引起的双重加密问题.最后给出了该方案的正确性及安全性验证.实验结果表明:对比同态加密方法,该方案节省执行时间5.12秒,并能及时侦测出恶意主机.

Addition-multiplication homomorphism and composite function encryption protecting scheme is put forward,aiming to solve the security problems of Mobile agents（MA） migrating across heterogeneous network execution environments.Homomorphism idea is applied to mobile cryptography,and encrypted mobile codes can be executed directly on different platforms without decryption.Addition-multiplication homomorphism（AMH） and composite function encryption strategies are introduced here,and encrypting steps are used as follows：first three address operands are encrypted by Addition-multiplication homomorphism method,then three address operating codes are encrypted by composite function method,double encryption problems are considered at last,and eliminating the statements that are encrypted by both AMH and composite function methods.Correctness and security are verified in this scheme.Experimental results show：By contrast to homomorphism encryption method,nearly 5.12s executing time will be saved using this addition-multiplication homomorphism and composite function encryption scheme,and malicious hosts are detected timely.