How to pass hidden parameters when redirecting to another page

I am redirected to the info page:

FacesContext.getCurrentInstance().getExternalContext().redirect("detailsTask?id=" + process.getId());

      

        
        
        
      

    

And the bean config:

<managed-bean>
    <managed-bean-name>detailsTaskBacking</managed-bean-name>
    <managed-bean-class>pt.ano.gspgsemdd.webapp.tasks.DetailsTaskBacking</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
    <managed-property>
        <property-name>id</property-name>
        <value>#{param.id}</value>
    </managed-property>
</managed-bean>

      

        
        
        
      

    

Thus, the link is visible and the identifier is also visible. I need to hide this id. Any idea?