Can't find a digit verification algorithm
I cannot find what algorithm is used to calculate the 2-digit check digit of my bank links.
Some examples
0404 3295 60983
0707 3328 25810
0900 9907 32991
0900 8912 91695
0707 2268 89938
0808 1153 45010
0808 0964 91963
0900 6632 28254
0707 2802 64344
0909 0256 01882
0707 3004 54587
0707 3164 30453
0404 2914 27064
0707 3306 30672
0404 1467 53870
0808 1733 55047
0808 2349 11733
0707 3158 51956
0707 3346 64573
0404 3396 83589
I know the last 2 digits are check digits because of the user account.
for example:
Area: 040
User account: 43266008
Bank reference: 0404 3266 00828
so... 28 <- Check digits.
I tried with Mod 97 and Base 10 (Luhn)
I do not know of other algorithms like: Mod 22, Base 36, Algorithm 45
¿Any idea?
Grouping and counting my samples, if it helps anything:
CheckDigits SamplesCount
01 2720
02 2698
03 2743
04 2719
05 2820
06 2737
07 2795
08 2737
09 2760
10 2778
11 2787
12 2780
13 2779
14 2658
15 2711
16 2770
17 2718
18 2675
19 2669
20 2675
21 2780
22 2737
23 2721
24 2723
25 2631
26 2694
27 2615
28 2800
29 2903
30 2718
31 2712
32 2733
33 2813
34 2782
35 2820
36 2754
37 2686
38 2755
39 2774
40 2688
41 2738
42 2799
43 2669
44 2774
45 2754
46 2623
47 2684
48 2711
49 2740
50 2735
51 2658
52 2793
53 2752
54 2782
55 2818
56 2718
57 2735
58 2738
59 2755
60 2716
61 2818
62 2738
63 2716
64 2710
65 2607
66 2640
67 2799
68 2763
69 2827
70 2968
71 2734
72 2679
73 2758
74 2730
75 2856
76 2713
77 2768
78 2694
79 2684
80 2693
81 2798
82 2739
83 2809
84 2754
85 2710
86 2833
87 2820
88 2739
89 2733
90 2739
91 2745
92 2805
93 2686
94 2771
95 2758
96 2754
97 2688
Example:
The link for Sears and Oxxo has a check digit which is Mod10 (Luhn).
(You can calculate the luhn check digit on this page: https://planetcalc.com/2464/ )
Reference: 0900 5719 759
Check digit (Luhn): 3
How do I get 88?
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1 answer
Maybe it will be useful, it includes the methods you described: https://docs.oracle.com/cd/E18727_01/doc.121/e13483/T359831T498954.htm
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