域名授权与加密问题
现在有这么一套PHP系统，可以对指定的域名进行安装授权，未授权的域名则无法安装使用．
我的域名ipinge.com的安装授权文件（license.key）的内容为：
GcGuHiPneUPtjA$r%nTJH+HiG1fRXujm0HN9RGUxu5sJYnDtsfCgs3$r%n9bad236918$r%nSMn4GSa0ehXv3WRRf9cUTE+8$r%nT8euHnK1eEfq22gPLoEWSUy6$r%nTsj/GSq1eUa632pVfoJARx/q$r%nT8b8GyHheBrk2DhTLNQTSRi8$r%nR5H2SCLoehXqim0Af9NAGB/r$r%nHZT2HiHhehrpjjlULoZEGxq5$r%nTZSuTCHofEC93W1RItVIG0u8$r%nR5b3GnKzfkfoh2lRLYEURxzt$r%nRsL7EyTpdhG6i2xRKNYVSh/v$r%nSMT3Eiq0fEe1zjVZfYFeHUXj$r%nSZT3TCO3fxTvjW4BeYFBSEi2$r%nHsb4GSS3LhPo2mQELdJDGBq9$r%nTZarTybleUC5hmQEfocUSxO6$r%nHpT8G3XlKhTtimgGe9MVRhrv$r%nTMj3SCrmeES9jGwAI4BGSRm5$r%nGsOpTiboLBHoi2pRftQVRxrv$r%nTMWtHia0fxq92DkCe9VGTBm9$r%nSsj6GiG3fhrkiG8CeddHHx23$r%nGsH3GHXkehXo3W8ALIFHT0/t$r%nHcWpHXDhfBDv2G9VKocVSRrs$r%nHcP9TifjdkO+3GQBedxESxzo$r%nR5GqEyK3dhe5i2QOKtITTBO4$r%nGsmsHibieka+h2hSedxEGxnv$r%nTcT2HSPpLBDojm5TftVHT068$r%nHZatE3HlKRPpiWwEKIUSSB+3$r%nScf2TCLifBDqh2VWLdUVGh65$r%nTMj5EyDkfBLs32sBLocTS0jt$r%nGsj/Tne0f0a4iGgOf4ZCHEjq$r%nTsWpHHLmfRq9221RKNBETkvs$r%nS8j9TCroexO62GkAfNRBSxO5$r%nRpKrGyXkehvkh2VRLdNHR0+9$r%nHsH9HSu0KRu4jT5UfNIUGh7q$r%nHZL9HCTgexK6h2pSeNVEHUi+$r%nHcj/SCu3ehPk3GwCItBCT063$r%nSpL3T3LhLhe/imUPLYJBTxm8$r%nS8esEifodke/3WUCeNZDSx65$r%nR8D8SSO0fhfqiGwEI9BIG0vq$r%nSMX4EiXjeBPpjz0FLNdDSRzv$r%nT8T2TyvmK0G52DgOedIVSkm+$r%nGcGtGXDpdhG4j2gBLdNBRk/q$r%nR8X+HyHndhDk3GtSIoJHGkvv$r%nRsSqG3bgK0S42D1TLN1AHRy/$r%nT8D+GCOzfxO52GVVL91ASRu5$r%nHsn4HyLnehbu3G1VL9NHGh+2$r%nRsmpG3HjfhTkjGRSL9BHTBm+$r%nT5KtGivmfhS42mUPK4VEGx68$r%nHsT5SyO0ehfqiWsEK4UUGBq6$r%nT5b8GSO0fUa63WkFeNcVHBzv$r%nHpSpGHe0K0O4iz0Gf4EVH0jr$r%nSJb+T3Dhdha+jjkBLNREHEu3$r%nSJH4HiPpLhHvijgEftEVTxK5$r%nGsL5SSqzfUO6iW5Te9ZFSRi5
请问这种加密是如何实现的？
我现在要实现同样的功能，可以对指定域名生成license.key授权文件．
------解决方案--------------------
“生成授权文件”并不是要点，要点在于“如何使用授权文件”。
一般而言，应该是你那套“PHP系统”在什么地方来读取这个授权文件，从里面提取出指定的域名，再跟实际运行时的主机域名相比较。
至于这个授权文件本身，无非是对某些授权信息（当然包括指定的域名，也许会有用户信息、授权时间限制等等）进行某种可逆的编码转换。如果你的“PHP系统”没有经过混淆加密的话，读一下源程序，这些就很容易搞清楚了。
------解决方案--------------------
顶楼上，
最好读读php代码操作key文件那部分
不过我估计你php代码肯定混淆过了吧
zend很方便解密，百度一下就有好多解密工具
Ioncube加密 就麻烦了，前段时间研究过，国内国外转了个遍，没啥进展
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