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TheFastSoftwareEncryptionWorkshop1999isthesixthinaseriesofworkshops startinginCambridgeinDecember1993. TheworkshopwasorganizedbyGeneralChairWilliamWolfowicz,Fon- zioneU. Bordoni,andProgrammeChairLarsKnudsen,UniversityofBergen, Norway,incooperationwithSecurteam,asfaraslocalarrangementswerec- cerned. TheworkshopwasheldMarch24-26,1999inRome,Italy. Theworkshopconcentratedonallaspectsoffastsecretkeyciphers,inc- dingthedesignandcryptanalysisofblockandstreamciphers,aswellashash functions. Therewere51submissions,allofthemsubmittedelectronically. Ones- missionwaslaterwithdrawnbytheauthors,and22paperswereselectedfor presentation. Allsubmissionswerecarefullyreviewedbyatleast4committee members. Attheworkshop,preliminaryversionsofall22papersweredistri- tedtoallattendees. Aftertheworkshoptherewasa nalreviewingprocesswith additionalcommentstotheauthors. Ithasbeenachallengeformetochairthecommitteeofthisworkshop,andit isapleasuretothankallthemembersoftheprogrammecommitteefortheirhard work.Thecommitteethisyearconsistedof,inalphabeticorder,RossAnd- son(Cambridge,UK),EliBiham(Technion,Israel),DonCoppersmith(IBM, USA), Cunsheng Ding (Singapore), Dieter Gollmann (Microsoft, UK), James Massey (Denmark), Mitsuru Matsui (Mitsubishi, Japan), Bart Preneel (K. U. Leuven, Belgium), Bruce Schneier (Counterpane, USA), and Serge Vaudenay (ENS,France). ItisagreatpleasuretothankWilliamWolfowiczfororganisingtheworkshop. Also,itisapleasuretothankSecurteamforthelogisticsandTelsyandSunfor supportingtheconference. Finally,abigthankyoutoallsubmittingauthorsfor theircontributions,andtoallattendees(approximately165)oftheworkshop. Finally, I would like to thank Vincent Rijmen for his technical assistance in preparingtheseproceedings. April1999 LarsKnudsen TableofContents AdvancedEncryptionStandard ImprovedAnalysisofSomeSimpli edVariantsofRC6 ...1 S. Contini,R. L. Rivest,M. J. B. Robshaw,andY. L. Yin LinearCryptanalysisofRC5andRC6...16 J. Borst,B. Preneel,andJ. Vandewalle ARevisedVersionofCRYPTON:CRYPTONV1. 0...31 C. H. Lim AttackonSixRoundsofCRYPTON...46 C. D'TheFastSoftwareEncryptionWorkshop1999isthesixthinaseriesofworkshops startinginCambridgeinDecember1993.TheworkshopwasorganizedbyGeneralChairWilliamWolfowicz,Fon- zioneU. Bordoni,andProgrammeChairLarsKnudsen,UniversityofBergen, Norway,incooperationwithSecurteam,asfaraslocalarrangementswerec- cerned. TheworkshopwasheldMarch24-26,1999inRome,Italy. Theworkshopconcentratedonallaspectsoffastsecretkeyciphers,inc- dingthedesignandcryptanalysisofblockandstreamciphers,aswellashash functions. Therewere51submissions,allofthemsubmittedelectronically. Ones- missionwaslaterwithdrawnbytheauthors,and22paperswereselectedfor presentation. Allsubmissionswerecarefullyreviewedbyatleast4committee members. Attheworkshop,preliminaryversionsofall22papersweredistri- tedtoallattendees. Aftertheworkshoptherewasa nalreviewingprocesswith additionalcommentstotheauthors. Ithasbeenachallengeformetochairthecommitteeofthisworkshop,andit isapleasuretothankallthemembersoftheprogrammecommitteefortheirhard work. Thecommitteethisyearconsistedof,inalphabeticorder,RossAnd- son(Cambridge,UK),EliBiham(Technion,Israel),DonCoppersmith(IBM, USA), Cunsheng Ding (Singapore), Dieter Gollmann (Microsoft, UK), James Massey (Denmark), Mitsuru Matsui (Mitsubishi, Japan), Bart Preneel (K. U.Leuven, Belgium), Bruce Schneier (Counterpane, USA), and Serge Vaudenay (ENS,France). ItisagreatpleasuretothankWilliamWolfowiczfororganisingtheworkshop. Also,itisapleasuretothankSecurteamforthelogisticsandTelsyandSunfor supportingtheconference. Finally,abigthankyoutoallsubmittingauthorsfor theircontributions,andtoallattendees(approximately165)oftheworkshop. Finally, I would like to thank Vincent Rijmen for his technical assistance in preparingtheseproceedings. April1999 LarsKnudsen TableofContents AdvancedEncryptionStandard ImprovedAnalysisofSomeSimpli edVariantsofRC6 ...1 S. Contini,R. L. Rivest,M. J. B. Robshaw,andY. L. Yin LinearCryptanalysisofRC5andRC6...16 J. Borst,B. Preneel,andJ. Vandewalle ARevisedVersionofCRYPTON:CRYPTONV1. 0...31 C. H. Lim AttackonSixRoundsofCRYPTON...46 C. D'Halluin,G. Bijnens,V. Rijmen,andB. Preneel OntheSecurityofthe128-bitBlockCipherDEAL...60 S. Lucks CryptanalysisofaReducedVersionoftheBlockCipherE2...71 M. MatsuiandT. Tokita OntheDecorrelatedFastCipher(DFC)andItsTheory...81 L. R. KnudsenandV. Rijmen RemotelyKeyedEncryption ScrambleAll,EncryptSmall...95 M. Jakobsson,J. P. Stern,andM. Yung AcceleratedRemotelyKeyedEncryption...112 S.Lucks AnalysisofBlockCiphersI MissintheMiddleAttacksonIDEAandKhufu...124 E. Biham,A. Biryukov,andA. Shamir ModnCryptanalysis,withApplicationsagainstRC5PandM6...139 J. Kelsey,B. Schneier,andD. Wagner TheBoomerangAttack...156 D. Wagner Miscellaneous TowardsMakingLuby-Racko CiphersOptimalandPractical ...171 S. Patel,Z. Ramzan,andG. S. Sundaram ANewCharacterizationofAlmostBentFunctions...186 A. Canteaut,P. Charpin,andH. Dobbertin ImprimitivePermutationGroupsandTrapdoorsinIteratedBlockCiphers. 201 K. G. Paterson VIII TableofContents ModesofOperation OntheSecurityofDoubleand2-KeyTripleModesofOperation...215 H. HandschuhandB. Preneel OntheConstructionofVariable-Input-LengthCiphers...231 M. BellareandP. Rogaway AnalysisofBlockCiphersII SlideAttacks...245 A. BiryukovandD. Wagner OntheSecurityofCS-Cipher...260 S. Vaudenay InterpolationAttacksoftheBlockCipher:SNAKE...275 S. Moriai,T. Shimoyama,andT. Kaneko StreamCiphers High-SpeedPseudorandomNumberGenerationwithSmallMemory...290 W. Aiello,S. Rajagopalan,andR. Venkatesan SOBERCryptanalysis...305 D. BleichenbacherandS. Patel AuthorIndex...317 ImprovedAnalysisof SomeSimpli edVariantsofRC6 1 2 1 1 ScottContini ,RonaldL. Rivest ,M. J. B.Robshaw ,andYiqunLisaYin 1 RSALaboratories,2955CampusDrive SanMateo,CA94403,USA fscontini,matt,yiqung@rsa. com 2 M. I. T. LaboratoryforComputerScience,545TechnologySquare Cambridge,MA02139,USA rivest@theory. lcs. mit.