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    <p>I am searching exactly the same thing you do and wanted to use php's openssl-functions, too. I was happy to see that on the phpside everything was working great with private/public key (encrypt/decrypt) and now wanted to find a way to use privatekey on clientside as you do.</p> <p>!!!</p> <p>IF you will find anything please let me know by email:</p> <p>pki (at) life.de</p> <p>!!!</p> <p>And for the performance aspect: You would encrypt the big parts with symetric encryption and only the decryption key with the public key of the client to excahnge it. So you dont't need to enrypt many kb.</p> <p>But it seems to be an dead end with firefox, but with IE and ActiveX it seems possible with CAPICOM (I had not much read about it now). hxxp://geekswithblogs.net/shahed/archive/2007/05/03/112232.aspx</p> <p>But for JavaScript/PHP have a look at (and read all comments at FAQ and other pages,too!In future maybe bidirectional communication was mentioned): hxxp://www.jcryption.org/</p> <p>hxxp://www.zend.com//code/codex.php?ozid=1323&amp;single=1</p> <p>Pure Javascript Public/Privatekey encryption hxxp://shop-js.sourceforge.net/crypto2.htm</p> <p>A helful FireFox-Addon for PKI: hxxps://addons.mozilla.org/en-US/firefox/addon/4471 hxxp://www.mozilla.org/projects/security/pki/nss/tools/index.html</p> <p>PHP with OpenSSL on Serverside / .NET on CLientside hxxp://www.csharpbydesign.com/2008/04/asymmetric-key-encryption-with.html</p> <p>Javascript OpenPGP</p> <p>hxxp://www.hanewin.net/encrypt/</p> <p>PS: stupid mechanism prevents me posting links ...</p>
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