eprint.iacr.orgpaperEvasive Inner Product Functional Encryption Is Broken Too
Evasive Inner Product Functional Encryption Is Broken Too is a 2026 ePrint paper by Agrawal, Modi, Yadav and Yamada. It gives a counterexample showing the evasive IPFE assumption of Hsieh, Lin and Luo (Eurocrypt 2024) is false in full generality. The attack extends the 2025 PRFE counterexample and needs only the weak inner product functionality, not pseudorandom function computation. The authors conclude that letting the adversary choose unrestricted private coins breaks the Evasive LWE family.
TL;DR Shows the evasive IPFE assumption, a "public coin" Evasive LWE variant, is false by extending the earlier PRFE counterexample.
Organisations named here
- Agrawal, Modi, Yadav and Yamada
- Evasive IPFE
- Evasive LWE
- Hsieh, Lin and Luo
- PRFE
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