Welcome to the resource topic for 2025/1011
Title:
Adaptive TDFs from Injective TDFs
Authors: Xinyu Mao, Hongxu Yi
Abstract:Adaptive trapdoor functions (ATDFs) and tag-based ATDFs (TB-ATDFs) are variants of trapdoor functions proposed by Kiltz, Mohassel, and O’Neill (EUROCRYPT 2010). They are both sufficient for constructing chosen-ciphertext secure public-key encryption (CCA-secure PKE), and their definitions are closely related to CCA-secure PKE.
Hohenberger, Koppula, and Waters (CRYPTO 2020) showed that CCA-secure PKE can be constructed from injective TDFs; however, the relations among TDF, ATDF, and TB-ATDF remain unclear.
We provide black-box constructions of ATDFs and TB-ATDFs from injective TDFs, answering the question posed by Kiltz, Mohassel, and O’Neill (EUROCRYPT 2010).
Our results indicate that ATDF, TB-ATDF, and TDF are equivalent under mild restrictions.
ePrint: https://eprint.iacr.org/2025/1011
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