To cite package ‘gpg’ in publications use:

  Ooms J (2025). _gpg: GNU Privacy Guard for R_. R package version
  1.4.0, <https://github.com/ropensci/gpg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gpg: GNU Privacy Guard for R},
    author = {Jeroen Ooms},
    year = {2025},
    note = {R package version 1.4.0},
    url = {https://github.com/ropensci/gpg},
  }