We have had plenty of debates in Congress and the media over whether the government should have a backdoor, and this is an end run (迂回战术) around that—here they come with an order to create that backdoor.
2017年12月六级真题（第三套）阅读 Section B
Yet it is worth noting that even if Apple ultimately loses this case, it has plenty of technical means to close a backdoor over time.
2017年12月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ
偷偷摸摸的；不正当的；后门的
You can use backdoor to describe an action or process if you disapprove of it because you think it has been done in a secret, indirect, or dishonest way.
If you say that someone is doing something through or by the backdoor, you disapprove of them because they are doing it in a secret, indirect, or dishonest way.