Lattice Based Forward-Secure Identity Based Encryption Scheme with Shorter Ciphertext – Journal of Internet Services and Information Security

Volume 3 - Issue 1 - 2

Lattice Based Forward-Secure Identity Based Encryption Scheme with Shorter Ciphertext

Kunwar Singh Computer Science and Engineering Department NIT Trichy, Tiruchirappalli, India
kunwar@nitt.edu
C. Pandurangan Computer Science and Engineering Department Indian Institute of Technology Madras Chennai, Tamil Nadu, India
prangan@cse.iitm.ac.in
A.K.Banerjee Mathematics Department NIT Trichy, Tiruchirappalli, India
banerjee@nitt.edu

DOI: 10.22667/JISIS.2013.02.31.005

Keywords: Lattice, Identity Based Encryption, Forward Security, Random Oracle Model, Learning With Error (LWE).

Abstract

In MIST 2012 conference Singh et al [21] presented lattice based forward-secure identity based encryption schemes based on LWE assumption in the random oracle model as well as in the standard model. In this paper we propose lattice based forward-secure identity based encryption scheme with shorter ciphertext in the random oracle model. We have reduced size of the ciphertext C from (m(i+2)+1)kZqk to (m+1)kZqk where kZqk is number of bits required to represent an element of Zq.

Date

February 2013

Page Number

5-19