Method enabling a user to verify the operation of a personal cryptographic device, comprising the following steps: a) a user (2) enters an access request in a terminal (3) (100), d) a personal cryptographic device (1) of the user (2) calculates and displays a response (105), g) the user (2) verifies the operation of the personal cryptographic device (1) by requesting the terminal (3) to display the expected response to the challenge (110), i) the terminal (3) displays the expected response to the challenge (113), j) the user (2) compares the response displayed by the personal cryptographic device with the response displayed by the terminal.