@DrPrime мало кто чего знает про bg, если знает , то делится не будет )
много интересного: https://www.google.com/search?q=recaptcha+bg+parameter
старенькая инфа:
https://github.com/neuroradiology/InsideReCaptcha
The browser then makes a requests to https://www.google.com/recaptcha/api2/anchor, whose response contains the very interesting stuff: a callback to a function called recaptcha.anchor.Main.init, which contains two base64-encoded parameters.
The first parameter points to a JavaScript file: https://www.google.com/js/bg/6yg-ggdQgQAg8SAADJkAjc-JMNnOnYuIGgH_iBV7uf8.js. The second one contains double-base64-encoded binary data.
It turned out this new ReCaptcha system is heavily obfuscated, as Google implemented a whole VM in JavaScript with a specific bytecode language.
The first parameter is the bytecode interpreter. After trimming the (function(){eval(' and ')})(), and passing it to JSBeautifier, I finally dove in this mass of minified code.
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