The size of proxy signature secret key in proxy signature scheme based on lattice basis delegation in fixed di-mension or bonsai tree is greater than that of original signature secret key. Aiming at the situation above. a new efficient proxy signature scheme is proposed. The random oracles are combined in the scheme and a smaller vector norm blind message is used to control the dimens... https://www.nacrack.com/flash-offer-On-Cloudmonster-clearance/