IACR News item: 24 July 2023
Léo Ducas, Thomas Espitau, Eamonn W. Postlethwaite
ePrint Report
We present cryptanalysis of the inhomogenous short integer solution (ISIS) problem for anomalously small moduli \(q\) by exploiting the geometry of BKZ reduced bases of $q$-ary lattices.
We apply this cryptanalysis to examples from the literature where taking such small moduli has been suggested. A recent work [Espitau–Tibouchi–Wallet–Yu, CRYPTO 2022] suggests small \(q\) versions of the lattice signature scheme FALCON and its variant MITAKA.
For one small \(q\) parametrisation of FALCON we reduce the estimated security against signature forgery by approximately 26 bits. For one small \(q\) parametrisation of MITAKA we successfully forge a signature in $15$ seconds.
We apply this cryptanalysis to examples from the literature where taking such small moduli has been suggested. A recent work [Espitau–Tibouchi–Wallet–Yu, CRYPTO 2022] suggests small \(q\) versions of the lattice signature scheme FALCON and its variant MITAKA.
For one small \(q\) parametrisation of FALCON we reduce the estimated security against signature forgery by approximately 26 bits. For one small \(q\) parametrisation of MITAKA we successfully forge a signature in $15$ seconds.
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