asp.net c#

Encrypt Decrypt a string in C# dotnet core 3.x - Data Security!

Encryption is the process that converting normal message Plain-text into Cipher-text. It is a process of converting normal data into an unreadable form. It helps you to avoid any unauthorized access to data.

Decryption is the process that converting Cipher-text into its original form Plain-text. It is a method of converting the unreadable/coded data into its original form.
This example will help you to encrypt and decrypt a plan text as string in dotnet core c#,

using System.IO;
using System.Text;
using System.Security.Cryptography;
using System;

public static class EncryptionHelper
{
  public static string Encrypt(string clearText)
  {
    string EncryptionKey = "Anilkey123";
    byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
            {
                cs.Write(clearBytes, 0, clearBytes.Length);
                cs.Close();
            }
            clearText = Convert.ToBase64String(ms.ToArray());
        }
    }
    return clearText;
 }

 public static string Decrypt(string cipherText)
 {
    string EncryptionKey = " Anilkey123";
    cipherText = cipherText.Replace(" ", "+");
    byte[] cipherBytes = Convert.FromBase64String(cipherText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }
            cipherText = Encoding.Unicode.GetString(ms.ToArray());
        }
    }
    return cipherText;
 }
}

Used of this method looks like,
string encryptedUserName = EncryptionHelper.Encrypt(userName_text);
string decryptedUserName = EncryptionHelper.Decrypt(encryptUserName);


ANIL SINGH

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