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2023-02-13 / Report
tlock: Practical timelock encryption from threshold BLS
We present a practical construction and implementation of timelock encryption, in which a ciphertext is guaranteed to be decryptable only after some specified time has passed. We employ an existing threshold network, the League of Entropy, implementing threshold BLS [BLS01, B03] in the context of Boneh and Franklin’s identity-based encryption (IBE).
Nicolas Gailly , Kelsey Melissaris, Yolan Romailler
2022-04-08 / Report
Witness-authenticated key exchange revisited: Improved models, simpler constructions, extensions to groups
We revisit the notion of Witness Authenticated Key Exchange (WAKE) where a party can be authenticated through a generic witness to an NP statement. We point out shortcomings of previous definitions, protocols and security proofs in Ngo et al.