Hello, I'm pretty new to programming so please be gentle. I'm transferring to a different school and a professor gave me an outline of a program they want me to write. I have already done everything they asked for, but I am really interested in security
so I added a way to encrypt and decrypt the file made by the program. I know it has no practical purpose, I just wanted to learn how to do it. Anyways; I almost have it working, but during decryption the first 4 bytes of my string are displayed as kanji and
korean characters and the rest is displayed properly. I have no idea where the problem is occurring. Any help would be appreciated.
Here is some of the code
public class CMethod
{
public TripleDES encryptMethod(string key)
{
Rfc2898DeriveBytes iv = new Rfc2898DeriveBytes(passphrase, salt);
MD5 m = new MD5CryptoServiceProvider();
TripleDES d = new TripleDESCryptoServiceProvider();
d.Key = m.ComputeHash(Encoding.Unicode.GetBytes(key));
d.IV = iv.GetBytes(d.BlockSize / 8);
return d;
}
public byte[] createEncryption(string sEncryption, string key)
{
TripleDES d = encryptMethod(key);
ICryptoTransform c = d.CreateEncryptor();
byte[] input = Encoding.Unicode.GetBytes(sEncryption);
return c.TransformFinalBlock(input, 0, input.Length);
}
public string createDecryption(string sDecryption, string key)
{
byte[] b = Convert.FromBase64String(sDecryption);
TripleDES d = encryptMethod(key);
ICryptoTransform c = d.CreateDecryptor();
byte[] output = c.TransformFinalBlock(b, 0, b.Length);
return Encoding.Unicode.GetString(output);
}
}
public void encryptFile()
{
string b = sEncryption;
CMethod c = new CMethod();
byte[] d = c.createEncryption(b, passphrase);
string e = Convert.ToBase64String(d);
File.WriteAllText(filePath, e);
}
public void decryptFile()
{
string b = File.ReadAllText(filePath);
CMethod c = new CMethod();
string d = c.createDecryption(b, passphrase);
File.WriteAllText(filePath, d);
}
I've been trying a few things and I got it a bit closer by changing the encoding in my createEncryption and createDecryption methods to UTF32, but the first 2 bytes in the array are still not showing up properly. At least it's no longer in kanji. Does anyone
have any ideas?
Decrypted string displays kanji and korean characters
