No, in fact according to India's own internal military report (the Henderson-Brooks report), it was India that attacked China in 1962, while we were in the middle of the worst famine in our history:
It wasn't China, but Nehru who declared 1962 war - The Times of India
(And you still lost.
)
As for the topic, this kind of "infiltration" is easier between USA/Russia/Israel, because all of these people are ethnically "white" looking. However they can't pass as Chinese, even half Chinese will be quite easy to see. (Keanu Reeves is half Chinese for example, and there is no way he would be able to pass as a local).
This isn't a Western country like the UK where their Prime Minister and everyone who could be Prime Minister is ethnically Jewish with foreign roots (Cameron, Miliband, etc.) Or America where there top leadership is Black/Hispanic. This is China, our top leadership are all Chinese.
The problem for us are Hanjian, those who will sell out their own motherland for a few USD. That's the real threat.