2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136239We give a new two-pass authentication scheme, whichis a generalisation of an authentication scheme of Sibert-Dehornoy-Girault based on the Diffie-Hellman conjugacy problem. Compared to the above scheme, for some parameters it is more efficient with respect to multiplications. We sketch a proof that our authentication scheme is secure. We give a new key agreement protocols.Cryptography and Securitytext