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ChangelogAsconv12Updateson31May2021asconv12pdf136FixtypoinSection251Re


136Updateddescriptionofalgorithmsforhashingandextendableoutputfunc-tionsinSection25TheynowallowtoinstantiateAscon-HashaandAscon-XofaPleasenotethatthechangesindescriptiondonotinuenceAscon-HashandAscon-

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Document on Subject : "ChangelogAsconv12Updateson31May2021asconv12pdf136FixtypoinSection251Re"— Transcript:

1 Changelog{Asconv1.2Updateson31May2021asc
Changelog{Asconv1.2Updateson31May2021asconv12.pdf:ˆFixtypoinSection2.5.1:Removeexcessiveandincorrectzerosin64-bitIVofAscon-HashandAscon-Hasha.Updateson17May2021(NISTLWCFinalRound)Algorithms:ˆThespeci cationsandtestvectorsofAscon-128,Ascon-128a,Ascon-80pq,Ascon-Xof,andAscon-Hashremainunchanged.ˆAddedanewhashfunctionAscon-HashaandextendableoutputfunctionAscon-XofatotheAsconfamiliy.ComparedtoAscon-HashandAscon-Xof,Ascon-HashaandAscon-Xofause8roundsduringabsorbingandmostofthesqueezinginsteadof12,whilethetransitionbetweenabsorbingandsqueezingstilluses12rounds.WehavereducedthenumberofroundswherethecurrentanalysisshowsaverylargesecuritymargininordertogetalessconservativeandfastervariantthatpairsnicelywithAscon-128a.Moreover,wehopethattheselessconserva-tivevariantsAscon-HashaandAscon-Xofaencouragemorecryptanalysisofthehashfunctioninthelastroundofthestandardizationprocess.asconv12.pdf:ˆUpdatedChapter1tointroducealsothenewvariantsAscon-HashaandAscon-XofaˆReplacedthealgorithmXh,r,awithXh,r,a,binordertode nenewvariantsAscon-HashaandAscon-XofainChapter2.Xh,r,a,bisidenticaltoXh,r,aifa=bandsoXh,r,a,a=Xh,r,a.ˆAddedAscon-HashatotherecommendedparametersetsatsecondplaceforhashfunctioninSection2.2.ˆAddedAscon-128aandAscon-Hashaasrecommendedpairingforauthen-ticatedencryptionandhashinginSection2.2. ˆUpdateddescriptionofalgorithmsforhashingandextendableoutputfunc-tionsinSection2.5.TheynowallowtoinstantiateAscon-HashaandAscon-Xofa.Pleasenotethatthechangesindescriptiondonotin uenceAscon-HashandAscon-Xof.Hence,Ascon-HashandAscon-Xofremainidenticaltothepreviousroundswiththetestvectorsstillthesame.ˆAddedsecurityclaimsforAscon-HashaandAscon-XofainChapter3.ˆSmallupdatesoffeaturesinChapter4.ˆAddeddesignrationaleforAscon-HashaandAscon-XofainChapter5.ˆUpdatedthesecurityanalysisofChapter6withrecentlypublishedinsightsintothesecurityofAscon.ˆAddedsectiononsize-optimizedAsconimplementationsinChapter7.ˆAddedrecentlypublishedpaperscoveringimplementationaspectstoChap-ter7.ˆFixedtypos.asconv12.tar.gz:ˆAddimplementationsforAscon-HashaandAscon-XofaˆAddcombinedsoftwareimplementationssupportingAEADandhashing:{Ascon-128andAscon-Hashincrypto aead hash/asconv12{Ascon-128aandAscon-Hashaincrypto aead hash/asconav12ˆAddsize-optimizedimplementationsˆAddAVX-512implementationsˆGeneralizecodebaseUpdateson27September2019(NISTLWCRound2)asconv12.pdf:ˆUpdatetitlepage(date,layout)ˆAddnewreferencestoSection7.4onimplementatio

2 nsecurityandrobust-ness.asconv12.tar.gz:
nsecurityandrobust-ness.asconv12.tar.gz:ˆUseconstant-timecomparison.2 Updated description of algorithms for hashing and extendable output functions in Section 2.5. They now allow to instantiate Ascon-HashaAscon-Xofa. Please note that the changes in description do not in\ruence Ascon-Ascon-Xof. Hence, Ascon-HashAscon-Xofremain identical to the previous rounds with the test vectors still the same. Added security claims for Ascon-HashaAscon-Xofain Chapter 3. Small updates of features in Chapter 4. Added design rationale for Ascon-HashaAscon-Xofain Chapter 5. Updated the security analysis of Chapter 6 with recently published insightsinto the security of AsconAdded section on size-optimized Asconimplementations in Chapter 7. Added recently published papers covering implementation aspects to Chapter 7. Fixed typos. Add implementations for Ascon-HashaAscon-XofaAdd combined software implementations supporting AEAD and hashing: Ascon-128 and Ascon-HashAscon-128a and Ascon-HashaAdd size-optimized implementations Add AVX-512 implementations Generalize code base UpdatesLWCRoundUpdate title page (date, layout) Add new references to Section 7.4 on implementation security and robustUse constant-time comparison. ChangelogAsconUpdatesMayFix typo in Section 2.5.1: Remove excessive and incorrect zeros in 64-bit IV ofAscon-HashAscon-HashaUpdatesMayLWCRound)The speci\fcations and test vectors of AsconAsconAsconAscon-Xof, and Ascon-Hashremain unchanged. Added a new hash function Ascon-Hashaand extendable output function Ascon-Xofato the Ascon familiy. Compared to Ascon-HashAscon-XofAscon-HashaAscon-Xofause 8 rounds during absorbing and most of the squeezing instead of 12, whilethe transition between absorbing and squeezing still uses 12 rounds. We havereduced the number of rounds where the current analysis shows a very largesecurity margin in order to get a less conservative and faster variant that pairs nicely with Ascon-128a. Moreover, we hope that these less conservative variants Ascon-HashaAscon-Xofaencourage more cryptanalysisof the hash function in the last round of the standardization process. Updated Chapter 1 to introduce also the new variants Ascon-HashaAscon-XofaReplaced the algorithm with in order to de\fne new variants Ascon-HashaAscon-Xofain Chapter 2. is identical to and so Added Ascon-Hashato the recommended parameter sets at second place forhash function in Section 2.2. Added Ascon-128a and Ascon-Hashaas recommended pairing for authenticated encryption and hashing in Section 2.2.