To cite diffpriv in publications use:

  Benjamin I. P. Rubinstein and Francesco Alda (2017). 'Pain-Free
  Random Differential Privacy with Sensitivity Sampling' in the 34th
  International Conference on Machine Learning (ICML'2017).

A BibTeX entry for LaTeX users is

  @InProceedings{,
    title = {Pain-Free Random Differential Privacy with Sensitivity Sampling},
    author = {Benjamin I. P. Rubinstein and Francesco Alda},
    year = {2017},
    booktitle = {34th International Conference on Machine Learning (ICML'2017)},
  }