针对Linux系统下加壳软件易被发现、易改变原有程序入口地址等一系列问题,提出了一种改进的软件加壳方法——加壳并重构可执行文件,即:SRELF(Shelling and Re-constructed Executable and LinkingFormat)。改进后的方法将壳程序和目标...针对Linux系统下加壳软件易被发现、易改变原有程序入口地址等一系列问题,提出了一种改进的软件加壳方法——加壳并重构可执行文件,即:SRELF(Shelling and Re-constructed Executable and LinkingFormat)。改进后的方法将壳程序和目标可执行文件中代码段、数据段等关键部分结合,使代码呈多态性后重新构造出新的可执行文件,使得加密软件运行的同时脱离原宿主计算机,避免了被保护软件因相同版本被破解形成通用的破解补丁。通过SRELF在安全性,透明性,伪装性和扩展性等方面的分析,证明了改进后的加壳方法在整体性能上都有显著的提高。展开更多
We experimentally studied con-specific interference in Ibalia leucospoides, a parasitoid of the woodwasp Sirex noctilio, on pine logs containing variable numbers of woodwasp larvae. Competiton occurred when two differ...We experimentally studied con-specific interference in Ibalia leucospoides, a parasitoid of the woodwasp Sirex noctilio, on pine logs containing variable numbers of woodwasp larvae. Competiton occurred when two different-sized female parasitoids foraged on a host patch, and consequently the small female always abandoned the patch. Regardless of host density, con-specific presence did not affect the attack rate, the number of hosts attacked, nor patch residence time by the winner, when compared to a control female that foraged alone. In contrast, con-specific presence reduced patch time and the number of hosts attacked by the loser. Finally patch time （by both） as well as number of hosts attacked （by the winner only） increased with host density per patch. Our results suggest that con-specific presence has different consequences for different-sized females during patch exploitation.展开更多
文摘针对Linux系统下加壳软件易被发现、易改变原有程序入口地址等一系列问题,提出了一种改进的软件加壳方法——加壳并重构可执行文件,即:SRELF(Shelling and Re-constructed Executable and LinkingFormat)。改进后的方法将壳程序和目标可执行文件中代码段、数据段等关键部分结合,使代码呈多态性后重新构造出新的可执行文件,使得加密软件运行的同时脱离原宿主计算机,避免了被保护软件因相同版本被破解形成通用的破解补丁。通过SRELF在安全性,透明性,伪装性和扩展性等方面的分析,证明了改进后的加壳方法在整体性能上都有显著的提高。
文摘We experimentally studied con-specific interference in Ibalia leucospoides, a parasitoid of the woodwasp Sirex noctilio, on pine logs containing variable numbers of woodwasp larvae. Competiton occurred when two different-sized female parasitoids foraged on a host patch, and consequently the small female always abandoned the patch. Regardless of host density, con-specific presence did not affect the attack rate, the number of hosts attacked, nor patch residence time by the winner, when compared to a control female that foraged alone. In contrast, con-specific presence reduced patch time and the number of hosts attacked by the loser. Finally patch time （by both） as well as number of hosts attacked （by the winner only） increased with host density per patch. Our results suggest that con-specific presence has different consequences for different-sized females during patch exploitation.
