Efficient construction of (distributed) verifiable random functions

Y Dodis - Public Key Cryptography—PKC 2003: 6th International …, 2002‏ - Springer
We give the first simple and efficient construction of verifiable random functions (VRFs).
VRFs, introduced by Micali et al.[13], combine the properties of regular pseudorandom …

Breaking and repairing optimistic fair exchange from PODC 2003

Y Dodis, L Reyzin - Proceedings of the 3rd ACM workshop on Digital …, 2003‏ - dl.acm.org
In PODC 2003, Park, Chong, Siegel and Ray [22] proposed an optimistic protocol for fair
exchange, based on RSA signatures. We show that their protocol is totally breakable …

Separable and anonymous identity-based key issuing

A Sui, SSM Chow, LCK Hui, SM Yiu… - … on parallel and …, 2005‏ - ieeexplore.ieee.org
In identity-based (ID-based) cryptosystems, a local registration authority (LRA) is
responsible for authentication of users while the key generation center (KGC) is responsible …

Time capsule signature

Y Dodis, DH Yum - Financial Cryptography and Data Security: 9th …, 2005‏ - Springer
We introduce a new cryptographic problem called time capsule signature. Time capsule
signature is a 'future signature'that becomes valid from a specific future time t, when a trusted …

Identity-based key issuing without secure channel in a broad area

S Kwon, SH Lee - International Workshop on Information Security …, 2006‏ - Springer
Despite many advantages of identity (ID)-based cryptosystems in removing certificates of
public keys over the traditional public key cryptosystems (PKC), some problems related to …