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String Encryption 

Visual Studio 2005

Crackers will frequently search for specific strings in an application to locate strategic logic. For example, someone looking to bypass a registration and verification process can search for the string displayed when the program asks the user for a serial number. When the attacker finds the string, he can look for instructions near it and alter the logic. String Encryption makes this much more difficult to do, because the attacker's search will come up empty. The original string is nowhere to be found in the code. Only its encrypted version is present.