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
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.