Nonces

nonce-url.php

$delete_link = wp_get_shortlink( get_the_ID() ) . '&delete=true';
$nonced_link = wp_nonce_url( $delete_link, 'delete-post-' . get_the_ID(), '_mynonce' );

simple-nonce-field-output.html

<input type="hidden" id="_wpnonce" name="_wpnonce" value="37b392c8a0" />
<input type="hidden" name="_wp_http_referer" value="/2015/02/13/my-article/" />

simple-nonce-field.php

wp_nonce_field( 'delete-post-' . get_the_ID() );

verify-get-nonce.php

if ( ! isset( $_GET['_mynonce'] ) || ! wp_verify_nonce( $_GET['_mynonce'], 'delete-post-' . $_GET['p'] ) 
) {
  // Do something if the nonce does not verify
  exit();
} 

// Process your form

verify-nonce.php

if ( ! isset( $_POST['field_name'] ) || ! wp_verify_nonce( $_POST['field_name'], 'action_name' ) 
) {
  // Do something if the nonce does not verify
  exit();
} 

// Process your form