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    <p>Here you go. I found it somewhere on the internet. Works well for me.</p> <pre><code> /// &lt;summary&gt; /// Encrypts a given password and returns the encrypted data /// as a base64 string. /// &lt;/summary&gt; /// &lt;param name="plainText"&gt;An unencrypted string that needs /// to be secured.&lt;/param&gt; /// &lt;returns&gt;A base64 encoded string that represents the encrypted /// binary data. /// &lt;/returns&gt; /// &lt;remarks&gt;This solution is not really secure as we are /// keeping strings in memory. If runtime protection is essential, /// &lt;see cref="SecureString"/&gt; should be used.&lt;/remarks&gt; /// &lt;exception cref="ArgumentNullException"&gt;If &lt;paramref name="plainText"/&gt; /// is a null reference.&lt;/exception&gt; public string Encrypt(string plainText) { if (plainText == null) throw new ArgumentNullException("plainText"); //encrypt data var data = Encoding.Unicode.GetBytes(plainText); byte[] encrypted = ProtectedData.Protect(data, null, Scope); //return as base64 string return Convert.ToBase64String(encrypted); } /// &lt;summary&gt; /// Decrypts a given string. /// &lt;/summary&gt; /// &lt;param name="cipher"&gt;A base64 encoded string that was created /// through the &lt;see cref="Encrypt(string)"/&gt; or /// &lt;see cref="Encrypt(SecureString)"/&gt; extension methods.&lt;/param&gt; /// &lt;returns&gt;The decrypted string.&lt;/returns&gt; /// &lt;remarks&gt;Keep in mind that the decrypted string remains in memory /// and makes your application vulnerable per se. If runtime protection /// is essential, &lt;see cref="SecureString"/&gt; should be used.&lt;/remarks&gt; /// &lt;exception cref="ArgumentNullException"&gt;If &lt;paramref name="cipher"/&gt; /// is a null reference.&lt;/exception&gt; public string Decrypt(string cipher) { if (cipher == null) throw new ArgumentNullException("cipher"); //parse base64 string byte[] data = Convert.FromBase64String(cipher); //decrypt data byte[] decrypted = ProtectedData.Unprotect(data, null, Scope); return Encoding.Unicode.GetString(decrypted); } </code></pre>
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    1. POPassword encryption/decryption code in .NET
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    1. COnice answer, i didn`t understand the Scope part of the protect method. I google it and i found you can use DataProtection.CurrentUser. Is that ok? or will it bring problems when decrypting? can you explain what you did to create your Scope Class. Thank you.
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    2. COPerhaps I am mistaken, but it looks like this solution is not portable across users / machines and is therefore not suitable for storing encrypted data. From the documentation: "the DPAPI stores the key data in user profiles". If you use this method to encrypt and store data, you will not be able to retrieve and decrypt the data from a different machine, or heaven forbid, if you rebuild your server.
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    3. COVisual Studio doesn't recognise "Scope"?
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