@misc{24986,
  author = {Shirley Radack},
  title = {Security of Electronic Mail},
  year = {2003},
  month = {2003-01-01},
  publisher = {ITL Bulletin, National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50749},
  language = {en},
}