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I'm building a blacklisting service for cracked iPhone apps and I am curious if I missed a method for detecting cracked apps. In the moment following app crack detection methods are available for the service: checking plist size checking signer identity checking if binary is crypted (not sure if this is working correctly since no cracked app got detected this way) checking modified date of info.plist against modified date of package (not sure if this is working - used code like: http://snippie.net/snip/f7530ff2 to do that) I also wonder if it is possible to check if the device is jailbroken? This would help, too, because the service will work much like a spam blacklist and jailbreak could be used to increase the score. I have also included a honeypot, which shows me that the tools used by the crackers eliminate some of the checks I do. For instance the plist check for size or signer identity. My question is now: Are there more "good" checks I should use? and Is there a way to detect Jailbreak?

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