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copied!<p>Well, you did not mention that the built-in class doesn't cover your need, so how about <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx" rel="nofollow noreferrer"><strong>System.Security.Cryptography.RSACryptoServiceProvider</strong></a>?</p> <p>It has a large set qualified ways to asymmetrically encrypt/decrypt streams.</p> <p>There are several tutorial/guides to take you along the way:</p> <p><a href="http://www.codeproject.com/KB/security/RSACryptoPad.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/security/RSACryptoPad.aspx</a></p> <p><a href="http://www.eggheadcafe.com/articles/20020630.asp" rel="nofollow noreferrer">http://www.eggheadcafe.com/articles/20020630.asp</a></p> <p>There are countless more to be found through <a href="http://www.google.se/search?q=.NET+RSACryptoServiceProvider" rel="nofollow noreferrer">Google</a>.</p> <p><strong>Update</strong>: About the length-restrictments, it's should not be any problems if you just implement the same buffer-algorithm on both sides, encryption and decryption.</p> <p><strong>Update2</strong>: Yes, my example was <strong>RSACryptoProvider</strong>, but you can use any class that derives from <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.asymmetricalgorithm.aspx" rel="nofollow noreferrer"><strong>System.Security.Cryptography.AsymmetricAlgorithm</strong></a>, if you want a public/private key-solution. Or build your own... or maybe not :)</p>

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