| 摘要 |
<p>The apparatus is provided, for a first user, with a freely accessible first input device (31) for an identification word and with a second input device (33) for a particular keyword, which are both inaccessible to a further user. A first encoding device (37) for the identification word and the secret keyword supplies a code word which is compared with an already stored code word by means of a comparator device. If both code words are identical, the transaction can be initiated. For this purpose, the apparatus contains a third input device (39), inaccessible to the first user, for a control word of the further user, the identification word and the secret key word, together with a control word, being encodable to the stored code word in a first encoding device (37). So that there is the possibility of keeping a secret keyword of the first user secret even from the further user, the further user also at the same time uses a similar control word in order to ensure that transactions can be conducted only by him and not by other users of the system. <IMAGE></p> |
