如果你需要在内存中存储密码，并且想要加密它，你应该使用SecureString:

http://msdn.microsoft.com/en-us/library/system.security.securestring.aspx

对于更一般的用途，我会使用FIPS批准的算法，如高级加密标准，以前称为Rijndael。请参阅本页的实现示例:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndael.aspx

如果你需要在内存中存储密码，并且想要加密它，你应该使用SecureString:

http://msdn.microsoft.com/en-us/library/system.security.securestring.aspx

对于更一般的用途，我会使用FIPS批准的算法，如高级加密标准，以前称为Rijndael。请参阅本页的实现示例:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndael.aspx

我所见过的最简单的加密方法是RSA

看看它的MSDN: http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

它确实涉及到使用字节，但当它归结到这一点时，你确实希望加密和解密很难弄清楚，否则就很容易被黑客攻击。

如果你的目标是ASP。NET Core还不支持RijndaelManaged，你可以使用IDataProtectionProvider。

首先，配置应用程序以使用数据保护:

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDataProtection();
    }
    // ...
}

然后你就可以注入IDataProtectionProvider实例，并使用它来加密/解密数据:

public class MyService : IService
{
    private const string Purpose = "my protection purpose";
    private readonly IDataProtectionProvider _provider;

    public MyService(IDataProtectionProvider provider)
    {
        _provider = provider;
    }

    public string Encrypt(string plainText)
    {
        var protector = _provider.CreateProtector(Purpose);
        return protector.Protect(plainText);
    }

    public string Decrypt(string cipherText)
    {
        var protector = _provider.CreateProtector(Purpose);
        return protector.Unprotect(cipherText);
    }
}

有关详细信息，请参阅本文。

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

public static class EncryptionHelper
{
    public static string Encrypt(string clearText)
    {
        string EncryptionKey = "abc123";
        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 = "abc123";
        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;
    }
}

您可能正在寻找ProtectedData类，它使用用户的登录凭证加密数据。