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- W2795417209 abstract "A chameleon-hash behaves likes a standard collision-resistant hash function for outsiders. If, however, a trapdoor is known, arbitrary collisions can be found. Chameleon-hashes with ephemeral trapdoors ( $$mathsf {CHET}$$ ; Camenisch et al., PKC 17) allow prohibiting that the holder of the long-term trapdoor can find collisions by introducing a second, ephemeral, trapdoor. However, this ephemeral trapdoor is required to be chosen freshly for each hash. We extend these ideas and introduce the notion of chameleon-hashes with dual long-term trapdoors ( $$mathsf {CHDLTT}$$ ). Here, the second trapdoor is not chosen freshly for each new hash; Rather, the hashing party can decide if it wants to generate a fresh second trapdoor or use an existing one. This primitive generalizes $$mathsf {CHET}$$ s, extends their applicability and enables some appealing new use-cases, including three-party sanitizable signatures, group-level selectively revocable signatures and break-the-glass signatures. We present two provably secure constructions and an implementation which demonstrates that this extended primitive is efficient enough for use in practice." @default.
- W2795417209 created "2018-04-13" @default.
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- W2795417209 date "2018-01-01" @default.
- W2795417209 modified "2023-10-14" @default.
- W2795417209 title "Chameleon-Hashes with Dual Long-Term Trapdoors and Their Applications" @default.
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- W2795417209 doi "https://doi.org/10.1007/978-3-319-89339-6_2" @default.
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