[cravenge]

So far, I've been studying IDA and its functionalities and I'm learning bit by bit but I'm getting confused by one thing: How can I tell if a signature I'm looking for is unique or not?

[backwards]

You can write a c++ program that scans for the signature in question via ReadProcessMemory or by injecting into the process. Just start the signature scan at the base address of the dll/binary you are looking for the signature in. Then you can use GetModuleHandle("binaryname.dll") - (0xAddressInIDA - 0x10000000 or the base address in IDA). Now you take that return value and add it to 0xIDABaseAddress and if it hits the same exact memory address you are looking for then you know. There are many public pattern scan source codes on the net.

Alternatively you can just download SigMaker by Patrick (or the updated version released on some cheat websites) and run that in IDA, it will automatically find the shortest unique signature for the function you have selected.

[psychonic]

IDA has a binary search function. You don't need a separate program to see if a signature is unique. Just run the search and confirm that there's exactly one result.