Authorized communications network mobile telephone authentication having SIM mobile telephone card receiving random numbers and authentication modifying two iterative loops having reciprocal functions applied substituting words.

摘要

The authentication algorithm has a secret key (E11) in a mobile telephone SIM card receiving random numbers (E04). Authentication is modified in two iterative loops. The first loop has words substituted (E51) in a table to apply a random function. The second loop has a reciprocal function applied (E41) to produce substitution words.