2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/30213We show that the Cao-Li cryptosystem proposed in \cite{CL1} is not secure. Its private key can be reconstructed from its public key using elementary means such as LU-decomposition and Euclidean algorithm.4 pages, article in its published form available from http://iel.ihs.com:80Cryptography and SecurityNumber TheoryE.3text