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    <p>This is what I do,</p> <ol> <li>On your website, create a secret string. I use the HMAC($_SERVER['REMOTE_ADDR'], key).</li> <li>Write the secret in a Javascript var.</li> <li>On the AJAX call, pass this string as a parameter.</li> <li>On the AJAX server, do the hash again. If it's matches the parameter, the call is from your page.</li> </ol> <p>EDIT: Code examples,</p> <p>In your website, you do this,</p> <pre><code>$key = 'supersecretkey'; // This is your security, don't expose this $nonce = rand(); $timestamp = time(); $signature = hash_hmac('sha1', $_SERVER['REMOTE_ADDR'] . $nonce . $timestamp, $key); </code></pre> <p>Print out the vars to the page,</p> <pre><code>&lt;script type="text/javascript"&gt; &lt;?php echo " var signature = '" . $signature . "';\n"; echo " var nonce = '" . $nonce . "';\n"; echo " var timestamp = '" . $timestamp . "';\n"; ?&gt; &lt;/script&gt; </code></pre> <p>When you make AJAX call, pass the 3 parameters to the server,</p> <pre><code> http://example.com?signature=...&amp;nonce=...&amp;timestamp=... </code></pre> <p>On the AJAX server, do the calculation again,</p> <pre><code>$key = 'supersecretkey'; // This is your security, don't expose this $nonce = $_REQUEST['nonce']; $timestamp = $_REQUEST['timestamp']; $signature = hash_hmac('sha1', $_SERVER['REMOTE_ADDR'] . $nonce . $timestamp, $key); if ($signature == $_REQUEST['signature']) // the call if from my page. </code></pre> <p>You can also chech timestamp for currency and nonce for replay (need session or data store).</p>
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    1. POHow can I restrict access to some PHP pages only from pages within my website?
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    1. CObut what happens if the user copies the string and post it to my server via his server :)
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    2. COHe has different IP so the hash doesn't match. But he can certainly call your website once and use that string. My implementation is actually more complicated to prevent that. I also create a timestamp and a nonce. So the AJAX call only works once in a limited time-window.
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    3. COCould you please give an example and do you managed to prevent abusing your services ?
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