Recently, for PRE related progress, Cannetti and Honhenberger [CCS '07] defined a stronger notion -- CCA-security and construct a bi-directional PRE scheme. Later on, several work considered CCA-secure PRE based on bilinear group assumptions. Very recently, Kirshanova [PKC '14] proposed the first single-hop CCA1-secure PRE scheme based on learning with errors (LWE) assumption. For PRS related progress, Ateniese and Hohenberger [CCS'05] formalized this primitive and provided efficient constructions in the random oracle model. At CCS 2008, Libert and Vergnaud presented the first multi-hop uni-directional proxy re-signature scheme in the standard model, using assumptions in bilinear groups.
In this work, we first point out a subtle but serious mistake in the security proof of the work by Kirshanova. This reopens the direction of lattice-based CCA1-secure constructions, even in the single-hop setting. Then we construct a single-hop PRE scheme that is proven secure in our new tag-based CCA-PRE model. Next, we construct the first multi-hop PRE construction. Lastly, we also construct the first PRS scheme from lattices that is proved secure in our proposed unified security model
Category / Keywords: public-key cryptography / Date: received 23 May 2017, last revised 25 May 2017 Contact author: xfan at cs cornell edu Available format(s): PDF | BibTeX Citation Version: 20170525:124431 (All versions of this report) Short URL: ia.cr/2017/456 Discussion forum: Show discussion | Start new discussion