ACISP2001, theSixthAustralasianConferenceonInformationSecurityandP- vacy, washeldinSydney, Australia. TheconferencewassponsoredbyInfor- tionandNetworkedSystemSecurityResearch(INSSR), MacquarieUniversity, theAustralianComputerSociety, andtheUniversityofWesternSydney. Iam gratefultoalltheseorganizationsfortheirsupportoftheconference. Theaimofthisconferencewastodrawtogetherresearchers, designers, and usersofinformationsecuritysystemsandtechnologies. Theconferenceprogram addressedarangeofaspectsfromsystemandnetworksecuritytosecureInternet applicationstocryptographyandcryptanalysis. Thisyeartheprogramcomm- teeinvitedtwointernationalkeynotespeakersDr. YacovYacobifromMicrosoft Research (USA) and Dr. Cli'ord Neumann from the University of Southern California(USA). Dr. Yacobi'stalkaddressedtheissuesoftrust, privacy, and anti-piracyinelectroniccommerce. Dr. Neumann'saddresswasconcernedwith authorizationpolicyissuesandtheirenforcementinapplications. Theconferencereceived91papersfromAmerica, Asia, Australia, and- rope. The program committee accepted 38 papers and these were presented insome9sessionscoveringsystemsecurity, networksecurity, trustandaccess control, Authentication, cryptography, cryptanalysis, DigitalSignatures, Elliptic CurveBasedTechniques, andSecretSharingandThresholdSchemes. Thisyear theacceptedpaperscamefromarangeofcountries, including7fromAustralia, 8fromKorea,7fromJapan,3fromUK,3fromGermany,3fromUSA,2from Singapore,2fromCanadaand1fromBelgium, Estonia, andTaiwan. Organizingaconferencesuchasthisoneisatime-consumingtaskandIwould liketothankallthepeoplewhoworkedhardtomakethisconferenceasuccess. Inparticular, IwouldliketothankProgramCo-chairYiMuforhistirelesswork andthemembersoftheprogramcommitteeforputtingtogetheranexcellent program, andallthesessionchairsandspeakersfortheirtimeande'ort. Special thanks to Yi Mu, Laura Olsen, Rajan Shankaran, and Michael Hitchens for theirhelpwithlocalorganizationdetails. Finally, Iwouldliketothankallthe authorswhosubmittedpapers