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For a more complex solution to the related problem of identifying program similarities and differences see BinDiff.
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IDA flirt signatures are an attempt to create these sorts of signatures based off of a number of the initial bytes of a function.
Now you have a couple of options for trying to match this. The signature I used above as an example is fairly worthless since it's way flirt avec sa copinet generic and will create a lot of false positive matches.
Current weather for 3, airports in the world overlayed on map. Assume stack frames use ebp and esp, which is actually more dangerous than it sounds.
Flirt With Disaster
Navigational waypoints and airways for high and low altitude flight overlayed on map. Forecasted areas of high level significant weather, available for up to a hour period in six hour increments Recorded lightning strikes shown on the map, updated every 15 minutes.
These signatures are generated by compiling various commonly used libraries using various compilers. The compiler is free to change any register to another one or move anything around so it all depends on what the compiler thinks is most optimal.
"copine" in English
A flirt signature is a pattern used to match known function headers. Global Radar provides worldwide areas of intense precipitation on the map, refreshed every 30 minutes. It's common for functions to use ebp as a general purpose register: As an example consider the following: The problem they are trying to solve is identifying commonly re-used code.
It uses much more advanced heuristics.
Flirt - Johannesburg - Gauteng - flirt.co.za
At-a-glance altitude and speed information when you hover over any portion of a selected flight's track. Various oceanic tracks, including North Atlantic Tracks overlayed on map.
Total precipitation shows areas of active precipitation on the map, refreshed 12 times a day. Boundaries of volcanic eruptions and ash clouds impacting aviation.
Has been played on
Global IR Satellite provides worldwide cloud cover displayed on the map, refreshed every 60 minutes. See where it is day and night on the map at a glance. Once the compiler produces a library IDA has tools to extract the signatures from this library while also matching it to its source definition.
Get an instant overview of the airport delay situation around the world or in a local region. Volcanic eruption when applicable.
Either naively create a signature from the sequence of instructions: Wind speed and direction on the map, in 1, ft increments, refreshed 12 times a day.
After a while you can build up quite a lot of signatures for common libraries which will save you quite a lot of time down the road. Compiled somewhere else the compiler may choose to use other registers, for instance: