# Overview

On penetrating GFW, people assume that strong encryption and random obfuscation may cheat GFW's filtration mechanism. However, trojan implements the direct opposite: it imitates the most common protocol across the wall, `HTTPS`, to trick GFW into thinking that it is `HTTPS`.

The [next page](protocol) introduces the trojan protocol and how it hides itself from active and passive detections.

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