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Question

please give best algorithm used for encrypt and decrpt a file...and how can implement?i need to develop an application software for email security and give code for the same.

Farhan Shariff · Answer

http://www.diaryofaninja.com/blog/2009/10/02/sending-encrypted-email-with-c http://stackoverflow.com/questions/12412054/sending-emails-that-requires-a-secure-connection http://www.codeproject.com/Articles/41727/An-S-MIME-Library-for-Sending-Signed-and-Encrypted //Rijndael algorithm. private void EncryptFile(string inputFile string outputFile) { try { string password = @myKey123; // Your Key Here UnicodeEncoding UE = new UnicodeEncoding(); byte[] key = UE.GetBytes(password); string cryptFile = outputFile; FileStream fsCrypt = new FileStream(cryptFile FileMode.Create); RijndaelManaged RMCrypto = new RijndaelManaged(); CryptoStream cs = new CryptoStream(fsCrypt RMCrypto.CreateEncryptor(key key) CryptoStreamMode.Write); FileStream fsIn = new FileStream(inputFile FileMode.Open); int data; while ((data = fsIn.ReadByte()) != -1) cs.WriteByte((byte)data); fsIn.Close(); cs.Close(); fsCrypt.Close(); } catch { MessageBox.Show(Encryption failed! Error); } } private void DecryptFile(string inputFile string outputFile) { { string password = @myKey123; // Your Key Here UnicodeEncoding UE = new UnicodeEncoding(); byte[] key = UE.GetBytes(password); FileStream fsCrypt = new FileStream(inputFile FileMode.Open); RijndaelManaged RMCrypto = new RijndaelManaged(); CryptoStream cs = new CryptoStream(fsCrypt RMCrypto.CreateDecryptor(key key) CryptoStreamMode.Read); FileStream fsOut = new FileStream(outputFile FileMode.Create); int data; while ((data = cs.ReadByte()) != -1) fsOut.WriteByte((byte)data); fsOut.Close(); cs.Close(); fsCrypt.Close(); } }