Introduction
I used symmetric key algorithm to secure the data. so the same key is used for
encryption and decryption of data.
in following class i used SHA1 algorithm,but u can also use MD5 algorithm by setting
string t_hashAlgorithm ="MD5"
For Extra security u can use salt.
u can set different parameters by setting the following properties of algorithm.
string t_salt = "yogesh"; // can be any string
string t_hashAlgorithm = "SHA1"; // can be "MD5"
int t_passwordIterations = 2; // can be any number
string t_initVector = "51cgc5D4e5F6gbc43"; // must be 16 bytes
int t_keySize = 256; // can be 192 or 128
I Have Given a NewSecurity Class below.
It has two stratic functions as below
1. public static string Encrypt(string p_plainText,string p_passPhrase )
2. public static string Decrypt(string p_cipherText, string p_passPhrase )
NewSecurity Class
public class NewSecurity
{
//encrypt fun takes the string to be encrypted and passward as a parameter and
return encrypted string
public static string Encrypt(string p_plainText,
string p_passPhrase )
{
string t_salt = "yogesh"; // can be any string
string t_hashAlgorithm = "SHA1"; // can be "MD5"
int t_passwordIterations = 2; // can be any number
string t_initVector = "51cgc5D4e5F6gbc43"; // must be 16 bytes
int t_keySize = 256; // can be 192 or 128
byte[] initVectorBytes = Encoding.ASCII.GetBytes(t_initVector);
byte[] saltBytes = Encoding.ASCII.GetBytes(t_salt);
byte[] plainTextBytes = Encoding.UTF8.GetBytes(p_plainText);
PasswordDeriveBytes password = new PasswordDeriveBytes(
p_passPhrase,
saltBytes,
t_hashAlgorithm,
t_passwordIterations);
byte[] keyBytes = password.GetBytes(t_keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform encryptor = symmetricKey.CreateEncryptor(
keyBytes,
initVectorBytes);
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream,
encryptor,
CryptoStreamMode.Write);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
memoryStream.Close();
cryptoStream.Close();
string t_cipherText = Convert.ToBase64String(cipherTextBytes);
return t_cipherText;
}
public static string Decrypt(string p_cipherText, string p_passPhrase )
{
string t_salt = "yogesh";
string t_hashAlgorithm = "SHA1";
int t_passwordIterations = 2;
string t_initVector = "51cgc5D4e5F6gbc43";
int t_keySize = 256;
byte[] initVectorBytes = Encoding.ASCII.GetBytes(t_initVector);
byte[] saltBytes = Encoding.ASCII.GetBytes(t_salt);
byte[] cipherTextBytes = Convert.FromBase64String(p_cipherText);
PasswordDeriveBytes password = new PasswordDeriveBytes(
p_passPhrase,
saltBytes,
t_hashAlgorithm, t_passwordIterations);
byte[] keyBytes = password.GetBytes(t_keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(
keyBytes,
initVectorBytes);
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
CryptoStream cryptoStream = new CryptoStream(memoryStream,
decryptor,
CryptoStreamMode.Read);
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes,
0,
plainTextBytes.Length);
memoryStream.Close();
cryptoStream.Close();
string t_plainText = Encoding.UTF8.GetString(plainTextBytes,
0,
decryptedByteCount);
return t_plainText;
}
}
Summary
IN THIS WAY U CAN SECURE UR DATA BY ENCRYPTING IT ......
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