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mean ECID.SHSH.
Well “ECID” stands for Exclusive Chip ID. This is a unique chip identification that is different for every AppleTV2, iPhone 3GS and iPod Touch 3g (eg.3371650952526). When you restore your device, iTunes contacts the Apple servers, to generate signatures, just for your device using ECID.SHSH. This a security feature, implemented by apple to stop jailbreaking of future firmwares. SHSH refers to a hash file that is in your AppleTV2 root file system.
Saurik, a member of the Dev Team, and creator of Cydia, has built a server that will store your ECID SHSH, if you select this option in Cydia.
Then you can use your stored ECID.SHSH file to create your own iTunes Restore Server so that you can restore Firmware on your phone even if apple is no longer allowing you to install it.
