title: Loading data from S3 to dask dataframe
body: <p>I can load the data only if I change the "anon" parameter to True after making the file public.</p>
  
  <pre><code>df = dd.read_csv('s3://mybucket/some-big.csv',  storage_options = {'anon':False})
  </code></pre>
  
  <p>This is not recommended for obvious reasons. How do I load the data from S3 securely?</p>