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    <p>Stackoverflow Extension library got two nice little extensions to encrypt&amp;decrypt string with RSA. <a href="https://stackoverflow.com/questions/271398?sort=votes&amp;page=1#sort-top">Topic Here</a> Used a few times myself but haven't tested it really , but it IS in SO Extension library so i assume it is tested&amp;stable.</p> <p>Encrypt ;</p> <pre><code>public static string Encrypt(this string stringToEncrypt, string key) { if (string.IsNullOrEmpty(stringToEncrypt)) { throw new ArgumentException("An empty string value cannot be encrypted."); } if (string.IsNullOrEmpty(key)) { throw new ArgumentException("Cannot encrypt using an empty key. Please supply an encryption key."); } System.Security.Cryptography.CspParameters cspp = new System.Security.Cryptography.CspParameters(); cspp.KeyContainerName = key; System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider(cspp); rsa.PersistKeyInCsp = true; byte[] bytes = rsa.Encrypt(System.Text.UTF8Encoding.UTF8.GetBytes(stringToEncrypt), true); return BitConverter.ToString(bytes); } </code></pre> <p>Decrypt ; </p> <pre><code>public static string Decrypt(this string stringToDecrypt, string key) { string result = null; if (string.IsNullOrEmpty(stringToDecrypt)) { throw new ArgumentException("An empty string value cannot be encrypted."); } if (string.IsNullOrEmpty(key)) { throw new ArgumentException("Cannot decrypt using an empty key. Please supply a decryption key."); } try { System.Security.Cryptography.CspParameters cspp = new System.Security.Cryptography.CspParameters(); cspp.KeyContainerName = key; System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider(cspp); rsa.PersistKeyInCsp = true; string[] decryptArray = stringToDecrypt.Split(new string[] { "-" }, StringSplitOptions.None); byte[] decryptByteArray = Array.ConvertAll&lt;string, byte&gt;(decryptArray, (s =&gt; Convert.ToByte(byte.Parse(s, System.Globalization.NumberStyles.HexNumber)))); byte[] bytes = rsa.Decrypt(decryptByteArray, true); result = System.Text.UTF8Encoding.UTF8.GetString(bytes); } finally { // no need for further processing } return result; } </code></pre>
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    1. POHow would I do some simple file encryption and decryption?
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    1. COExactly the answer I was looking for, something that works, and not overly complicated. I'll use this as a reference for learning more about RSA. Thanks again Tiax
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    2. COOk for short strings but it will fail for input strings longer than 86 chars. In general, RSA is not well suited for large bodies of data.
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      1. USHenk Holterman
 

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