Lattice Forward-Secure Identity Based Encryption Scheme

Kunwar Singh¹*, C. Pandurangan², and A.K.Banerjee¹

¹Computer Science and Engineering Department

NIT Trichy, Tiruchirappalli, India

{kunwar, banerjee}@nitt.edu

²Computer Science and Engineering Department

IIT Madras, India

rangan@cse.iitm.ac.in

Abstract

Protecting secret keys is crucial for cryptography. There are some relatively insecure devices (smart

cards, mobile phones etc.) which have threat of key exposure. The goal of the forward security is to

protect security of past uses of key even if the current secret key is exposed. In this paper we propose

lattice based forward-secure identity based encryption scheme based on LWE assumption in random

oracle model. We also propose lattice based forward-secure identity based encryption scheme in the

standard model.

Keywords: lattice, identity based encryption, forward security, random oracle model,
learning with error (LWE)

*Corresponding author: CSE Department, NIT Trichy, Tiruchirappalli-15, Tamilnadu, India,
Tel: +91-043125013212, Email: kunwar2081@gmail.com