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POpublic key cryptograpy with Java and OpenSSL
 

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    <p>In an application I want to store sensitive data (which can be arbitrarily large) so that it can later be used for researching. The point is that I don't want the data to lie around unprotected, so I want to encrypt it before saving it.</p> <p>On another computer (in a more trustworthy environment) I want to decrypt that data later. The decryption should be possible with readily available tools, for example OpenSSL. Now my question is: How do I do all that?</p> <p>I already know the abstract steps:</p> <ol> <li>Once and for all generate a public/private key pair.</li> <li>Encrypt a <code>byte[]</code> in Java using the public key, store it somewhere.</li> <li>Copy the encrypted data to a "safer" computer.</li> <li>Decrypt the saved data using a simple OpenSSL command line.</li> </ol> <p>What I'm missing now are the details:</p> <ul> <li>What kind of key pair do I need?</li> <li>What encryption scheme should I use? (it's probably something like "rsa-encrypt a symmetric key, then encrypt the data with that key")</li> <li>How does the simple OpenSSL command line look like?</li> </ul> <p><strong>[Update 2011-02-13]</strong></p> <p>After a little research I found a page that describes exactly what I want to do: <a href="http://blog.altudov.com/2010/09/27/using-openssl-for-asymmetric-encryption-of-backups/" rel="nofollow">http://blog.altudov.com/2010/09/27/using-openssl-for-asymmetric-encryption-of-backups/</a>. Basically the answer to my step 4 is this command line:</p> <pre><code>openssl smime -decrypt \ -in data.smime -binary -inform DER \ -inkey key.pem \ -out data </code></pre> <p>Now my question is: How can I generate a file from Java whose format is compatible to OpenSSL so I can decompress it using this command line? I want to do this hundrets of times per second, so invoking an external process seems too slow. That's why I want to do it directly in Java.</p>
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