Those interested in this topic may enjoy Ange Albertini's presentation at the 31st Chaos Communication Congress, on "Funky File Formats", https://events.ccc.de/

Those interested in this topic may enjoy Ange Albertini's presentation at the 31st Chaos Communication Congress, on "Funky File Formats", https://events.ccc.de/congress/2014/Fahrplan/events/5930.html https://events.ccc.de/congress/2014/Fahrplan/events/5930.htm... . > Binary tricks to evade identification, detection, to exploit encryption and hash collisions. * artistic binaries - why they are possible, how they work. - quines - polyglots & chimeras - schizophrenic - AngeCryption - hash collisions The presentation video and slides are available. It has examples of mixing multiple binary formats together, including valid files for one format which, when decrypted, produce another valid format.