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Let me show you a magic trick for debit/credit cards

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Finance Ninja
abhishek012

Let me show you a magic trick debit/credit cards:

Take out your debit/credit card, and see the digits (For example 𝟰𝟬𝟬𝟬 𝟬𝟬𝟭𝟮 𝟯𝟰𝟱𝟲 𝟳𝟴𝟵𝟵)

Start from the first digit, multiply it by 2 and repeat this process for all digits which are at odd positions. So, after calculation, you would be seeing them like (𝟴-0-𝟬-0 𝟬-0-𝟮-2 𝟲-4-𝟭𝟬-6 𝟭𝟰-8-𝟭𝟴-9)

By this time, you might have noticed that some numbers after multiplication resulted in a 2-digit number. So, for such 2-digits numbers, add both of their digits to generate a single-digit number.
After this stage, your numbers would be like (8-0-0-0 0-0-2-2 6-4-𝟭-6 𝟱-8-𝟵-9)

Now, you have to just add all these digits together, the sum for my example would be: 8+0+0+0+0+0+2+2+6+4+1+6+5+8+9+9=60

This resultant sum would be always divisible by 10 if your debit/credit card number is valid.

This is not a magic trick, but Luhn's Algorithm/Checksum, which is used to validate your input number by card-issuing authorities.

Luhn Algorithm makes it possible to check numbers (Credit card, debit card, SIRET, etc.) thanks to its control key. If a character is misread or badly written, then Luhn's algorithm will detect this error.
Luhn Algorithm is known because MasterCard, American Express (AMEX), Visa, RuPay card and all other credit/debit cards use it.

The algorithm is in the public domain and is in wide use today. It is not intended to be a cryptographically secure hash function; it was designed to protect against accidental errors, not malicious attacks. Most credit cards and many government identification numbers use the algorithm as a simple method of distinguishing valid numbers from mistyped or otherwise incorrect numbers.

Now, let's come to its weakness:
The verification algorithm does not allow the detection of certain permutations of digits. This is the case for pairs 09 and 90: any number containing a 0 replaced by a 9 and a 9 replaced by a 0 has an identical checksum.
Another weakness is the failure to detect a double error like 22 from/to 55 or 33 from/to 66 or even 44 from/to 77.
Also, The presence or absence of leading zeroes at the beginning of the number does not modify the checksum. It can be an advantage as well as a disadvantage.

Tell me in the comments about this magic trick!
(Also, the below image is of a dummy card 😉)

https://cdn0.desidime.com/attachments/photos/818125/medium/1666409451162.jpg?1666445262

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Benevolent Benevolent
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jadugar Abhishek ke liye jordar taliyaan 👏🏻

Deal Cadet Deal Cadet
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le li Abhishek(not Rahul) baba ki tumne. 😝


Cool Cool
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https://cdn0.desidime.com/attachments/photos/818133/medium/8785361sunil-crying.gif?1666445831

Generous Generous
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Yeah, It's very well known algo! Also known as mod 10 algo. Used for IMEI number and many other numbers as well.

Finance Ninja Finance Ninja
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Yup, actually kuch logo ko pata nahi hote hai.

Ek banda mere se bola tha ki usne ICICI RuPay card apply kiya toh suppose last number 2250 tha and dusra ICICI RuPay card apply kiya toh 2300 mila. Toh aisa kuch bol raha tha Iska mtlb ICICI ne 50 card ab tak issue kar diye.

Phir ek banda multiple BOB virtual RuPay Platinum debit card generate pe bhi same baat bola tha aur yehi normal calculation se kuch lakhs cards ab tak issue kar diye aisa bola tha.

Ustime bola tha maine Num10 algorithm ka use karte ha credit cards se. Aise thorai na 1 k baad 1 issue kar dete hai. 😀
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Benevolent Benevolent
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Keep posting such posts only.

Hotshot Hotshot
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rupay bhai example m mastercard dediya 🙃
Deal Subedar Deal Subedar
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rupayshek bhaiya bolo
Helpful Helpful
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Ye to hui Gyan ki baatein blush Isme loot kaha hai stuck_out_tongue_winking_eye Wo aap dena bhul gaye Abhishek Bhai stuck_out_tongue_winking_eye stuck_out_tongue_winking_eye
Pro Analyst Pro Analyst
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'Loot' Diwali celebrate karne mein busy hai... stuck_out_tongue_winking_eye
Generous Generous
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Going by the title, I thought @abhishek012 is exposing/killing another cc trick today joy joy joy  
Helpful Helpful
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this is not magic trick but Luhn algorithm 


Deal Newbie Deal Newbie
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@abhishek012 bhai yehi sab share kiya karo.. baki loot woot sab moh maya hai, nazar padte hi fus hojati hai

Btw is post k liye ye lo link, aur ek k baad ek credit/debit card number sab bna lo.

https://namso-ge...m/

Freebie Finder Freebie Finder
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Good information 👍🏻

Maine upne kids ko homework de diya hai ki ye 20 card ko check Karo 😛😛😛

Crowdpuller Crowdpuller
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"Luhn" how do i pronounce this?
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Like Magnet Like Magnet
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Deal Lieutenant Deal Lieutenant
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@abhishek012 my Virtual BOB Debit Card is giving error when I TAP on the card to get the CVV. Can you help me on this?
Finance Ninja Finance Ninja
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Try after sometime.
replyuser
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