@TechReport{Dartmouth:TR91-158,
  author = {Matt Bishop},
  title = {{Implementation Notes on bdes(1)}},
  institution = {Dartmouth College, Computer Science},
  address = {Hanover, NH},
  number = {PCS-TR91-158},
  year = {1991},
  URL = {http://www.cs.dartmouth.edu/reports/TR91-158.pdf},
  abstract = {
    	This note describes the implementation of bdes, the file
    encryption program being distributed in the 4.4 release of the
    Berkeley Software Distribution.  It implements all modes of the Data
    Encryption Standard program.
  }
}