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    <p>I would suggest to do something similar to what Git utilises(have a look at <a href="http://git-scm.com/book/en/Git-Internals-Git-Objects" rel="nofollow">http://git-scm.com/book/en/Git-Internals-Git-Objects</a> to understand how git implements it), i.e.</p> <blockquote> <p><strong>Creating SHA1 values of the content of every file in your chrome-extension</strong> and then re-create another SHA1 value of the concatenated SHA1 values obtained earlier.</p> </blockquote> <p>In this way, you can share the SHA1 value with your server and authenticate your extension, as the SHA1 value will change just in case any person, changes any of your file.</p> <p>Explaining it in more detail with some pseudo code:</p> <pre><code>function get_authentication_key(){ var files = get_all_files_in_extension, concatenated_sha_values = '', authentication_key; for(file in files){ concatenated_sha_values += Digest::SHA1.hexdigest(get_file_content(file)); } $.ajax({ url: 'http://example.com/getauthkey', type: 'post' async: false, success:function(data){ authentication_key = data; } }) //You may return either SHA value of concatenated values or return the concatenated SHA values return authentication_key; } // Server side code get('/getauthkey') do // One can apply several type of encryption algos on the string passed, to make it unbreakable authentication_key = Digest::&lt;encryption&gt;.hexdigest($_GET['string']); return authentication_key; end </code></pre> <p>This method allows you to check if any kind of file has been changed maybe an image file or a video file or any other file. Would be glad to know if this thing can be broken as well.</p>
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    1. POHow to check the authenticity of a Chrome extension?
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    1. USApoorv Saxena
    1. USApoorv Saxena
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    1. COWouldn't somebody would go to the trouble of imitating the behavior of an extension to match another's simply overwrite this function to return the expected value (obtained by running the function on the real extension) instead of the real hash?
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    2. COYep.. had thought of it, and the way you can overcome is to have a function defined on the server's side, that takes the concatenated hash string and applies another encryption algorithm over it and returns the Hash value.. in this way your part of the function to generate Hash doesn't get exposed to the guy wanting to break your code.
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    3. COHere there are 2 problems: The main problem is you can't access the files to generate the hashes. Secondly the files are on the client side so if it came down to it then the client could simply send you the other files when you want to verify. Plus having it on the server side would generate lots of unnecessary network traffik @Cody
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