string _password;
    
        static bool EnterPassword()
        {
            Console.Write("password: ");

            _password="";

            while(true)
            {
                ConsoleKeyInfo cki = Console.ReadKey(true);

                if(cki.Key == ConsoleKey.Enter)
                {
                    Console.WriteLine();

                    return true;
                }
                else
                {
                    if(cki.Key == ConsoleKey.Escape)
                    {
                        _password = "";

                        return false;
                    }
                    else
                    {
                        if(Char.IsLetterOrDigit(cki.KeyChar) || Char.IsSymbol(cki.KeyChar))
                        {
                            _password+=cki.KeyChar;
                            Console.Write("*");
                        }
                        else
                        {
                            if(cki.Key == ConsoleKey.Backspace)
                            {
                                if(_password.Length > 0)
                                {
                                    ReplaceEntry(" ", Console.CursorLeft - 1, Console.CursorTop);
                                    _password = _password.Remove(_password.Length - 1);
                                }
                            }
                            else
                            {
                                Debug.Assert(false, "Этот случай невозможен!   ");
                            }
                        }
                    }
                }
            }
        }