CCA-secure key encapsulation mechanism based on factoring assumption

Abstract

In this article a key encapsulation mechanism is presented which is based on squaring function, where the input element is from$QR^{+}_{N} $, where
$QR^{+}_{N} $ denotes the signed quadratic residue group, and N is a Blum integer. The
article presents the soundness, the effciency and the proof of CCA security of the
proposed mechanism.