The invention relates to a method and to a device for the
authorization in
data transmission systems employing a transaction
authorization number (TAN) or a comparable
password. According to a first step, the user sends a qualifying identification of the
data input apparatus together with a request for the generation or for the selection of a transaction
authorization number TAN or of comparable
password from a
data file from the
data input apparatus to an authorization computer. In a second step the authorization computer generates the transaction authorization number TAN or the comparable
password or selects them form a
data file. According to a third step, the authorization computer sends the transaction authorization number TAN or the comparable password over a second transmission path different from the first transmission path to a monitor, for example a
pager. According to a fourth step, the user reads this transaction authorization number TAN or the comparable password from the
receiver and enters the transaction authorization number TAN or the comparable password into the
data input apparatus. According to a fifth step, this transaction authorization number TAN or the comparable password is transmitted to the authorization computer. According to a sixth step, the authorization computer verifies the validity of the transaction authorization number TAN or of the comparable password in order to establish or switch free, according to a seventh step, a connection between the data input apparatus and the
receiver unit.