Lattice Based Forward-Secure Identity Based Encryption Scheme with Shorter Ciphertext
Kunwar Singh, C. Pandurangan, A. K. Banerjee · 2012
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)k Zqk to (m+ 1)k Zqk wherekZqk is number of bits required to represent an element of Zq.