/// <summary>
/// Gets an encrypted server stamp.
/// </summary>
public static string GetServerStamp(long sessionID, byte[] secretKey)
{
byte[] bytes = secretKey == null
? BitConverter.GetBytes(sessionID)
: ScadaUtils.EncryptBytes(BitConverter.GetBytes(sessionID), secretKey, CreateIV(sessionID));
return(ScadaUtils.ComputeHash(bytes));
}