Date Added: Oct 2010
In this paper, the authors propose a set of Ring Signature (RS) schemes and Identity-Based Ring Signature (IBRS) schemes using the lattice basis delegation technique due to, the schemes are unforgeable and hold anonymity in the random oracle model. Using the method in, they also extend the constructions to obtain RS and IBRS schemes in the standard model. The proposed ring signature schemes fit with ring trap-door functions introduced by Brakerski and Kalai. However, their work does not include ring signature in the random oracle model and identity-based ring signature schemes.