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intelligence_src_e53adb99e40ae66258
observed · 2026-10-12 16:25:04 UTC
ePrint Report: A Note on Extractable Witness Encryption in Generic Groups Matteo Campanelli Hair and Sahai have recently proposed a construction of witness encryption for NP satisfying semantic security. In this short note we observe that this recent witness-encryption construction is unconditionally extractable in the generic group model. This yields a construction of extractable witness encryption without assuming subexponential soundness of SNARGs, in contrast to the recent work of Jin (eprint:2026/2063), which requires this assumption. The result in this note, moreover, complements the concurrent work of Chen and Vaikuntanathan (eprint:2026/2346), who show the same construction to be public-coin extractable under a knowledge-style assumption; our argument is unconditional, but in the GGM.
Fingerprint: 270697cf56317dbb8c3dbb26fc6bd2284cb58376729c8ed4643718ea6db8969e
intelligence_src_e53adb99e40ae66258
observed · 2026-10-12 16:25:03 UTC
available
Fingerprint: 366cb966e32414edc1db353849a1ee8d6b8462b83786e04001881ba6594765ad