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DTSTART:20260308T070000
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DTSTART:20251102T060000
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DTSTART;TZID=America/Toronto:20260612T153000
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/tutte-colloq
 uium-douglas-stebila-adding-functionality-post
SUMMARY:Tutte Colloquium -Douglas Stebila-Adding functionality to post-quan
 tum\ncryptography with variants of the Fujisaki-Okamoto transform
CLASS:PUBLIC
DESCRIPTION:SPEAKER:\n Douglas Stebila\n\nAFFILIATION:\n University of Wate
 rloo\n\nLOCATION:\n MC 5501\n\nABSTRACT: The Fujisaki-Okamoto (FO) transf
 orm is a fundamental\nbuilding block in new post-quantum cryptography stan
 dards like NIST's\nML-KEM\, where it is used to convert a weakly secure pu
 blic key\nencryption scheme into a key encapsulation mechanism (KEM) secur
 e\nagainst active attackers. In this talk\, we'll explore two approaches\n
 to add extra security and functionality to post-quantum KEMs by\nenhancing
  the FO transform. First\, we see how a birthday-style\ncollision argument
  lets an attacker who collects many ciphertexts\nhalve the security of the
  FrodoKEM and HQC standards\, and how\nextending the FO transform with pub
 lic salts thwarts this multi-target\nattack. Second\, we turn to implement
 ation flaws: for 19 months\, HQC's\nreference implementation effectively s
 kipped a security-critical\nverification step\, yet basic correctness test
 s still passed. We show\nhow the principle of \"verifiable verification\"\
 , via an extension of\nthe FO transform\, ties security to functionality\,
  so that an\nimplementation which that skips it visibly breaks.
DTSTAMP:20260604T214315Z
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