ThepurposeofPrinciplesofInformationSecurity,FourthEdition,istofilltheneedforaqualityacademictextbookthatsurveysthedisciplineofinformationsecurity.Whiletherearedozensofqualitypublicationsoninformationsecurityandassurancethatareorientedtothepractitioner,thereisadearthoftextbooksthatpr