section_heading: Tehnički detalji
paragraph_text: Poznat i kao Ska, Happy99 se širio preko e-mail privitaka i Useneta.Chen, William W. L. (2005). Statistical methods in computer security. New York, N.Y: Marcel Dekker. pp. 272. ISBN 0-8247-5939-7.<ref>Michael J. Isaac; Isaac, Debra S. (2003). The SSCP prep guide: mastering the seven key areas of system security. New York: Wiley. pp. 0471273511. ISBN 0-471-27351-1.