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Wang et al. introduced a new variant of small integer solution (SIS), namely, bilateral inhomogeneous small integer solution (Bi-ISIS) which is based on lattice cryptography, and constructed a Bi-ISIS-based key exchange (KE) protocol. In this paper, we indicate that Wang et al.’s Bi-ISIS-based KE protocol is not secure because a common shared key can be recovered directly by using linear algebraic...
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