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DTSTART;TZID=America/Toronto:20260130T103000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/crypto-readi
 ng-group-mojtaba-fadavi-new-lattice-based
SUMMARY:Crypto Reading Group -Mojtaba Fadavi-A new lattice-based threshold\
 nsignature scheme with Identifiable Aborts (IA)
CLASS:PUBLIC
DESCRIPTION:Speaker\n Mojtaba Fadavi \n\nAffiliation\n University of Waterl
 oo\n\nLocation\n MC 6029\n\nABSTRACT: A (t\,n)-threshold signature scheme
  splits a signing key\namong \"n\" participants so that any \"t\" can join
 tly produce a valid\nsignature under a single public key\, while fewer tha
 n \"t\" cannot.\nThere are three common types of threshold signature schem
 es: (i)\nRobust schemes\, which guarantee signature production provided at
  least\n\"t\" parties are honest\; (ii) Identifiable-abort schemes\, which
  may\nfail to produce a signature but expose at least one misbehaving\nsig
 ner\; and (iii) Simple schemes\, which guarantee neither robustness\nnor i
 dentifiable abort\, but output a valid signature when \"t\" honest\npartic
 ipants collaborate without deviating from the protocol.\n\nMotivated by NI
 ST's recent emphasis on post-quantum multiparty and\nthreshold designs\, t
 his talk presents a new approach to centralized\,\nlattice-based (t\,n)-th
 reshold signatures. We first construct a\n(t\,n)-threshold one-time signat
 ure and then upgrade it to a many-time\nscheme by combining it with a long
 -term signature so that all\nthreshold signatures verify under a single pu
 blic key.
DTSTAMP:20260402T151911Z
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