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When you create custom firmware for routers, you often have to forge the signature so that your handmade microcode can be flushed using the stock web interface. To forge a signature, you must be familiar with the image validation procedure in the stock firmware. To get a general idea of this process, let’s reverse firmware embedded into the D-Link DIR-806A B1 router and find out how signature validation is implemented in it.

Humanity has created a whole bestiary of scripting languages ​​with low learning curves in an attempt to make the IT world accessible to imbeciles newbies who have completed a month-long course. Without question, Python is currently the king of beasts in this bestiary. The creeping reptile has entangled the entire IT industry with its rings so much that even a neural network cannot be trained without it. If so, time has come to dissect the serpent and look at its insides. Let’s start with a technology called PyInstaller.