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Ouroboros Clepsydra: Ouroboros Praos in the Universally Composable Relative Time Model
proof of stake blockchain UC model
2019/8/19
Ouroboros Praos is a proof of stake based blockchain protocol. One of its security assumptions is parties are synchronized i.e., all of them knows when the protocol passes a new state. However, it is ...
Sampling the Integers with Low Relative Error
Sampling Discrete Gaussians Lattice-based Cryptography
2019/1/26
Randomness is an essential part of any secure cryptosystem, but many constructions rely on distributions that are not uniform. This is particularly true for lattice based cryptosystems, which more oft...
Double-and-Add with Relative Jacobian Coordinates
elliptic curve relative Jacobian coordinates co-Z coordinates
2016/1/5
One of the most efficient ways to implement a scalar multiplication on elliptic
curves with precomputed points is to use mixed coordinates (affine and Jacobian).
We show how to relax these precondit...