Question:

How to securely encrypt and decompose string in C# to protect data?

C# offers powerful encryption tools to securely encrypted and unlocked string. One method is to use advanced encryption standards (AES) and objects. The following is an example of code:

To encrypted the string, please use your plaintext and sharing key to call RijndaelManaged. During decryption, the shared key must match. To decrypt, please use encrypted ciphertexts and shared keys to call

public class Crypto
{
    // 用于密鑰生成的鹽
    private static byte[] _salt = { /* 在此處添加您的應(yīng)用程序?qū)Ｓ名} */ };

    // 使用 AES 加密字符串
    public static string EncryptStringAES(string plainText, string sharedSecret)
    {
        // 密鑰生成
        Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);

        // 初始化 RijndaelManaged 對(duì)象
        RijndaelManaged aesAlg = new RijndaelManaged();
        aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);

        // 創(chuàng)建加密器和流
        ICryptoTransform encryptor = aesAlg.CreateEncryptor();
        using (MemoryStream msEncrypt = new MemoryStream())
        using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
        {
            // 加密并寫入流
            swEncrypt.Write(plainText);
        }

        // 轉(zhuǎn)換為 Base64 字符串
        return Convert.ToBase64String(msEncrypt.ToArray());
    }

    // 使用 AES 解密加密的字符串
    public static string DecryptStringAES(string cipherText, string sharedSecret)
    {
        // 密鑰生成
        Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);

        // 從 Base64 字符串轉(zhuǎn)換
        byte[] bytes = Convert.FromBase64String(cipherText);
        using (MemoryStream msDecrypt = new MemoryStream(bytes))
        {
            // 初始化 RijndaelManaged 對(duì)象
            RijndaelManaged aesAlg = new RijndaelManaged();
            aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
            //aesAlg.IV = ReadByteArray(msDecrypt);  //移除IV讀取，因?yàn)槭纠a中IV處理有誤

            // 創(chuàng)建解密器和流
            ICryptoTransform decryptor = aesAlg.CreateDecryptor();
            using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
            using (StreamReader srDecrypt = new StreamReader(csDecrypt))
            {
                // 解密并從流中讀取
                return srDecrypt.ReadToEnd();
            }
        }
    }

    // 從流中讀取字節(jié)數(shù)組的輔助方法 (此方法在示例中未被使用，且有潛在錯(cuò)誤，故移除)
    //private static byte[] ReadByteArray(Stream s) { ... }
}

Additional description: EncryptStringAES(plainText, sharedSecret) DecryptStringAES(cipherText, sharedSecret)

Use a powerful shared key to encrypt. Consider using salt to enhance safety.

Correctly handle abnormalities and errors.
For more secure implementation, explore other encryption algorithms and methods. Note: There are problems with the function in the original code, and it is not actually used in the example, so it has been removed. The correct IV processing method needs to be adjusted according to the specific AES usage mode. This simplified version removes IV, assuming the default mode of AES. In practical applications, you need to choose the appropriate AES mode according to the needs and properly handle the IV.
• This Revned Answer Improves The Code by USING
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