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POTwo-way folder sync with encryption to secure my Dropbox data
 

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    <p>I'd like to write a little .NET script/tool which does at least mostly the same like <a href="http://getsecretsync.com/ss/" rel="nofollow">SecretSync</a> or <a href="http://www.boxcryptor.com/" rel="nofollow">BoxCryptor</a>, but without storing the encryption key on a company's web servers.</p> <p>First it sounds very simple: You have two folder - a "decryped"-folder and and "encrypted"-folder. On both folders there is an <a href="http://msdn.microsoft.com/library/system.io.filesystemwatcher%28v=VS.100%29.aspx" rel="nofollow">FileSystemWatcher</a> so the tool gets notified when a file has changed. If a file changes in the "decryped"-folder, it encrypts the file and writes it to the "encrypted"-folder. If a file changes in the "encrypted"-folder, it decrypts the file and writes it to the "decrypted"-folder.</p> <p>No problem so far.</p> <p>But what happens if the users runs a application (like <a href="http://www.keepass.info" rel="nofollow">KeePass</a> for example) directly from the "decryped"-folder? The sync and encryption process will now run into problems because the files are locked from the application. Is there someting i can do to avoid this problem handled, so the application can still run beside the sync and encryption process?</p> <p>Thanks for any help!</p> <p><strong>Update:</strong> I still couldn't find a answer to this question. When using FileSystemWatcher-class for syncing it is easy to apply the encryption/decryption, but you are running into problems with file locks (because of the streams or applications blocking the files). I also tried Microsoft Sync Framework. File sync works with it, but i don't know how to encrypt/decrypt the files on the fly.</p> <p>Maybe someone has a little working code sample.</p>
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