jQuery Validate not validating on form submit

I'm facing some problems with jQuery Validate. I've already put the rules but when i'm submitting the form, nothing happens.

I'm using ASP.NET MVC 4 and Visual Studio 2010.

EDIT: Click here to see my entire code. I'm trying to post it here but i'm getting the following error: 403 Forbidden: IPS signature match. Below is part of my code with Andrei Dvoynos's suggestion. I'm getting the same error. Clicking on submit and the page being reloaded

@{
ViewBag.Title = "Index";
}
@section Teste1{
<script type="text/javascript">
        $(document).ready(function () {
        $("#moeda").maskMoney();
        $("#percent").maskMoney();
        $(":input").inputmask();
          $('#tel').focusout(function () {
            var phone, element;
            element = $(this);
            element.unmask();
            phone = element.val().replace(/\D/g, '');
            if (phone.length > 10) {
                element.inputmask({ "mask": "(99) 99999-999[9]" });
            } else {
                element.inputmask({ "mask": "(99) 9999-9999[9]" });
            }
          }).trigger('focusout');
//the code suggested by Andrei Dvoynos, i've tried but it's occurring the same.
        $("#form1").validate({
          rules: {
             cpf: { required: true, },
             cep: { required: true, },
             tel: { required: true, },
             email: { required: true, },
             cnpj: { required: true, },
          },
          highlight: function (element) {
            $(element).closest('.form-group').addClass('has-error');
          },
          unhighlight: function (element) {
            $(element).closest('.form-group').removeClass('has-error');
          },
          errorElement: 'span',
          errorClass: 'help-block'
        });            
    });
</script>
}
@using (@Html.BeginForm("", "", FormMethod.Post,
             new { id = "form1", name = "form1" }))
{
<fieldset>
    <legend>Sign In</legend>
    <div class="form-group" id="divCpf">
        <label for="cpf">CPF</label>
        <input data-inputmask="'mask': '999.999.999-99'" class="form-control" id="cpf" />
    </div>
    <div class="form-group" id="divCep">
        <label for="cep">CEP</label>
        <input data-inputmask="'mask' : '99999-999'" type="text" class="form-control" id="cep" placeholder="CEP" />
    </div>
    <div class="form-group" id="divTel">
        <label for="tel">Telefone</label>
        <input type="text" class="form-control" id="tel" placeholder="tel" />
    </div>
    <div class="form-group" id="email">
        <label for="email">Email</label>
        <input type="text" class="form-control" id="email" placeholder="Email" />
    </div>
    <div class="form-group" id="divcnpj">
        <label for="cnpj">CNPJ</label>
        <input data-inputmask="'mask' : '99.999.999/9999-99'" type="text" class="form-control" id="cnpj" placeholder="CNPJ" />
    </div>
    <div class="form-group">
        <label for="moeda">Moeda</label>
        <input type="text" id="moeda" data-allow-zero="true" class="form-control" />
    </div>
    <div class="form-group">
        <label for="Percent">Percent</label>
        <input type="text" id="percent" data-suffix="%" data-allow-zero="true" class="form-control" maxlength="7" />
    </div>
    <input type="submit" class="btn btn-default" value="Sign In" id="sign" />
</fieldset>
}

My tests (all unsuccessful):

1 - put the $("form").validate() into $(document).ready()

2 - put the required class on the fields.

jQuery Validate plugin version: 1.13.0