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POImplement secure communication using RSA encryption in C#
 

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  1. POImplement secure communication using RSA encryption in C#
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    <p>I want to implement a scenario where two endpoints can securely communicate with each other using public/private key encryption. The scenario is following:</p> <p>For A to send a message to B:</p> <blockquote> <p>A encrypts the message using A's private key. </p> <p>A encrypts the message using B's public key.</p> <p>A sends the message. </p> <p>B receives the message.</p> <p>B decrypts the message using A's public key. </p> <p>B decrypts the message using B's private key.</p> <p>B reads the message.</p> </blockquote> <p>Here is what I have in C# using RSA encryption:</p> <pre><code>// Alice wants to send a message to Bob: String plainText = "Hello, World!"; Byte[] plainData = Encoding.Default.GetBytes(plainText); Byte[] cipherData = null; RSACryptoServiceProvider alice = new RSACryptoServiceProvider(); RSACryptoServiceProvider bob = new RSACryptoServiceProvider(); var alicePrivateKey = alice.ExportParameters(true); var alicePublicKey = alice.ExportParameters(false); var bobPrivateKey = bob.ExportParameters(true); var bobPublicKey = bob.ExportParameters(false); RSACryptoServiceProvider messenger = new RSACryptoServiceProvider(); messenger.ImportParameters(alicePrivateKey); cipherData = messenger.Encrypt(plainData, true); messenger.ImportParameters(bobPublicKey); cipherData = messenger.Encrypt(cipherData, true); messenger.ImportParameters(alicePublicKey); cipherData = messenger.Decrypt(cipherData, true); messenger.ImportParameters(bobPrivateKey); cipherData = messenger.Decrypt(cipherData, true); String result = Encoding.Default.GetString(alice.Decrypt(cipherData, true)); </code></pre> <p>Clearly, there is something wrong with the following lines:</p> <pre><code>messenger.ImportParameters(bobPublicKey); cipherData = messenger.Encrypt(cipherData, true); </code></pre> <p>Which throws <em>System.Security.Cryptography.CryptographyException</em> with message <em>{ "Bad Length" }</em>.</p> <p>As I can see it is not able to encrypt the data using just the public part of bob's key.</p> <p>Can someone throw some light on how to properly accomplish what I want to do in <em>C#</em>?</p>
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