At first, I attempted to Base64-encode a minified version of this JavaScript and include it within the onerror event of the XSS payload. It would then be decoded and executed using eval(atob()), as shown below:
The sentence is from How I Built An XSS Worm On Atmail. I have met this one serveral time. I can't understand this well. Here I know that the author is assuming that he tried to build xss payload, then the result may be like what he think instead of the reality. Therefore, What's phrase 'It would then be' mean? What's the meaning of word then here?
Best Answer
This is a kind of "future in the [hypothetical] past". It corresponds to "It will then be decoded" in the present.
So the writer is saying "If I had succeeded in ..., it would then ["next"] be decoded ... "