Encryption Using RSA in asp.net

Task: Encryption using RSA algorithm in asp.net.

Description: There are various Encryption-Decryption techniques. RSA is one of them. Encryption using RSA algorithm in asp.net. Here first we generate the key pair public-private key. Then we encrypt an de-crypt the data using keys.

using System;

using System.Security.Cryptography;

using System.Text;
using System.IO;

public partial class rsaencryption : System.Web.UI.Page

{

  public void rsaencryption()

  {

    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

    string publicPrivateKeyXML = rsa.ToXmlString(true); // private key - Save it

    string publicOnlyKeyXML = rsa.ToXmlString(false);  // public key

    lbl_key.Text = publicPrivateKeyXML;

    string text = TextBox1.Text; // Plain Text

    rsa.FromXmlString(publicOnlyKeyXML);

    byte[] data = Encoding.UTF8.GetBytes(text);

    byte[] cipherText = rsa.Encrypt(data, false);

    Label2.Text = Convert.ToBase64String(cipherText); // Encrypted Data

  }

 

  public void rsadecryption()

  {

    RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

    rsa.FromXmlString(lbl_key.Text); // Private Key as we generated at encryption

    byte[] ciphterText = Convert.FromBase64String(Label2.Text); // Encrypted Data

    byte[] plainText = rsa.Decrypt(ciphterText, false);

    Label3.Text = Encoding.UTF8.GetString(plainText); // Plain Text (Decrypted)

  }

}