SenhaConsole.cs

public static string LerSenha()
{
    StringBuilder pw = new StringBuilder();
    bool caracterApagado = false;

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

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

        if (deletarTexto(cki))
        {
            if (pw.Length != 0)
            {
                Console.Write("\b \b");
                pw.Length--;

                caracterApagado = true;
            }
        }
        else
        {
            caracterApagado = false;
        }

        if (!caracterApagado && verificarCaracterValido(cki))
        {
            Console.Write('•');
            pw.Append(cki.KeyChar);
        }
    }

    return pw.ToString();
}

private static bool verificarCaracterValido(ConsoleKeyInfo tecla)
{
    if (char.IsLetterOrDigit(tecla.KeyChar) || char.IsPunctuation(tecla.KeyChar) ||
        char.IsSymbol(tecla.KeyChar))
    {
        return true;
    }
    else
    {
        return false;
    }

}

private static bool deletarTexto(ConsoleKeyInfo tecla)
{
    if (tecla.Key == ConsoleKey.Backspace || tecla.Key == ConsoleKey.Delete)
        return true;
    else
        return false;
}