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POFile encryption library for .NET
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  1. POFile encryption library for .NET
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    copied!<p>I'm looking for a file encryption library under .NET. <strong>It needs to be able to seek</strong> so <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.cryptostream.aspx" rel="nofollow noreferrer" title="CryptoStream">CryptoStream</a> is out of question. (I know it inherits a Seek method but it's not implemented.)</p> <p>I need to seek because my application deals with large files in a non-sequential order. I also <strong>need to read and write the files at the same time</strong>.</p> <p>I know that most of the time <a href="http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Cipher-block_chaining_.28CBC.29" rel="nofollow noreferrer">CBC</a> is used for file encryption but seeking (and writing) is impossible using it. But somehow full disk encryption softwares like <a href="http://www.truecrypt.org/" rel="nofollow noreferrer">TrueCrypt</a> and <a href="http://en.wikipedia.org/wiki/BitLocker_Drive_Encryption" rel="nofollow noreferrer">BitLocker</a> manage to use it like that. (<em>Edit: TrueCrypt doesn't use CBC any more, they moved to <a href="http://en.wikipedia.org/wiki/Disk_encryption_theory#LRW" rel="nofollow noreferrer">LRW</a> then to <a href="http://en.wikipedia.org/wiki/Disk_encryption_theory#XTS" rel="nofollow noreferrer">XTS</a>. My point is that it's possible.</em>)</p> <p>This is a hobby project so I'm interested in free libraries. Also it doesn't matter if it only supports .NET 4.</p> <p><strong>Edit</strong>: <a href="http://www.bouncycastle.org/" rel="nofollow noreferrer">Bouncy Castle</a> isn't good because it's <em>CipherStream</em> can't seek just like .NET's CryptoStream.</p>
 

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