Mono Documentation

Generate a new random Initialization Vector (IV) required for some block cipher modes. [Edit]

public override void GenerateIV ()

Remarks

The IV is used for most SymmetricAlgorithm.Mode of operation (except CipherMode.ECB). The value can be made public and must be available when decrypting the data.
IMPORTANT: If you reuse the same DES object for multiple encryption using the same key it is CAPITAL that you use a different IV each time.
C# Example
DES des = DES.Create ();
des.Key = new byte[] { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF };
foreach (string file in files) {
	// each file MUST be encrypted with a different IV
	des.GenerateIV ();
	// encrypt the specified file with our DES key
	EncryptFile (file, des);
}
  
[Edit]

Requirements

Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0

System.Security.Cryptography.DESCryptoServiceProvider.GenerateIV Method

Remarks

Requirements