2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99236Recently, a new scheme was proposed for deniable authentication. Its main originality lied on applying a chaos-based encryption-hash parallel algorithm and the semi-group property of the Chebyshev chaotic map. Although original and practicable, its insecurity and inefficiency are shown in this paper, thus rendering it inadequate for adoption in e-commerce.8 pages, 1 figure, latex formatChaotic Dynamicstext