AUTHENTICATION METHOD, AUTHENTICATION SYSTEM, SERVER TERMINAL, CLIENT TERMINAL AND COMPUTER PROGRAMS THEREFOR

摘要

An authentication method for use between a client (2) and a server (4) that share a secret (6). The method comprises the following steps: the server (4) generates a random value (40); the server (4) computes a first encrypted value (46); the server (4) concatenates the random value (40) and the first encrypted value (46) to form a challenge (10); the client (2) retrieves the random value (40) and the first encrypted value (46) from the challenge (10); the client (2) computes a second encrypted value (48); the client (2) compares the first (46) and second (48) encrypted values; and the client (2) authenticates the server (4) when the first (46) and second (48) encrypted values match.