| 摘要 |
A method and apparatus for verifying a personal identification number and checking a number series put onto an identification medium, containing information readable by machine in the form of a card and account number and permanent information in the form of a permanently inscribed number, include a first unit (2,4,22,24,6,8,10,12,14,16,18,20) for encryption of the card or account number (PAN) with an algorithm defined by a first key. The unit includes elements (6,8,10,12,14,16,18) for forming the first key of the personal identification number (PIN) in combination with a first key number (K1). The apparatus further contains a second unit (30,32,42,34,36,12,14,40,38) for generating a personal check number (PCN) by decryption of coded information obtained from the first unit with the aid of an algorithm defined by a second key. A third unit (44,46,48,70,66,68,80,82,64,76) is further adapted for encrypting the card or account number with the aid of the algorithm defined by the first key, and a fourth unit (44,48,52,24,70,72,74,82,64,88) is adapted for encrypting the personal check number with the aid of the algorithm defined by the second key. A comparison circuit (58), connected to the outputs from the third and fourth units, compares the coded card or account number and the coded personal check number for determining whether these numbers are in a predetermined relationship. The second and fourth units include elements (42,34,36,12,14,40,38; 72,74,82,64,88) for forming the second key from the permanent number (FN) in combination with a second key number (K2). |
