Things are getting worse even for an ordinary computer programmer to bypass the Internet walls in some countries or districts. There are quite a lot of techniques involved in making a working solution to get through the walls safely to smoothly.
Knowledge on TCP/IP is an entry for this exam. Deep understanding of the walls is an essential point and other requirements are data communications, data security, network security and data encryption.
Besides those above, programmers are also being asked what application is being deployed over the wall. The most-deployed application is HTTP, and therefore they need to understand more than usual on its protocols. Multiple operating systems and programming languages could help programmers easily get things done.
What’s more, for both sides, the battles of blocking and anti-blocking are always continually being evolved and they just look like spear vs. shield. One working technique may fail tomorrow if it has been acquired by another side.
Here is a workflow based on what we have learnt from $hadow$ocks, one of the most-starred repositories on GitHub.
Work flow:
–> packets plain sent (1)
–> $hadow$ocks-windows-client(2) –> obfs-local(3)
–> packets wrapped over Internet
–> obfs-server(4) –> $hadow$ocks-libev-server(5)
–> packets REQUEST & RESPONSE (6)
–> $hadow$ocks-libev-server(7) –> obfs-server(8)
–> packets wrapped over Internet
–> obfs-local(9) –> $hadow$ocks-windows-client(10)
–> packets plain recv (11)
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