Authentication in a radiotelephone network

Increasing the operation authentication between two units the invention relates to a telecommunications network the connection method, the hole is mobile terminal (MS) and a network (is special, comprising a visitor location registerand the wireless cellular telephone network, ancestral home location registerand (VLR, HLR) and authentication centre). The network fixed to a terminal (is more exact, front of the SIM card) and first a authentication units (E9, E94, E10), and based on algorithm the second a authentication with an (E2-E6), the input with and realizes the transmission of the fixing network of any and a first an operation authentication key values (Ki) different key values (Kj). Is a one end of the transmission of the fixing and network terminal respectively signature and signature result (RSG), and compares the terminal, in order to containing end of the first a authentication operation (E2-E6) of the two equal situation.