| 摘要 |
A method for certifying the presence of an operator includes a presence code (104) requested (202) at a given time instant (21, 22) to a first device (103) operable by a user (102); the first device (103) generates (203) the presence code (104), the presence code (104) including a portion generated according to an encoding algorithm (25), wherein the generated portion depends on the time instant (21, 22) and on an identifier (23) of the first device (103); a second device (105) operable by an operator (101) stores (204) the generated presence code (104); the presence code (104) is transmitted (109) to a third validation device (108); the third validation device (108) certifies (212) the presence of the operator (101) at the user (102) at the time instant (21, 22); the certification (212) including: providing the third validation device (108) with at least one piece of time information (21, 206, 306) about the time instant (21, 22), and further providing (205) the identifier (23) of the first device (103), wherein the presence code (104) is validated (208) by comparing it (26) with at least one second presence code (27) generated (25) by the third validation device (108) according to the same encoding algorithm (25) and according to the piece of time information (21, 206, 306) and according to the identifier (23), wherein certification (212) occurs if the comparison (26) shows a match between the presence code (104) and the second presence code (27). |
