Decoding Secret Credit Card Numbers & Phone Recharge Codes

In summary, the conversation was about "trap door" codes and the difficulty of decoding them without knowing the correct factors. It was mentioned that while it is possible to decode them with the correct factors and powerful computers, it is not a smooth process. The example of RSA-640 being factored after extensive effort and computing power was also discussed.
  • #1
debayan
7
0
how are the secret codes for recharging the credit of a phone or the secret credit card numbers gnerated? i hrd something with prime nos. any way to decode them?
 
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  • #2
I assume you are talking about "trap door" codes- where you can be told how to encode a messsage but that doesn't help you decode it. I don't know all the details but essentially it uses the fact that while it is relatively easy to multiply two large (prime) numbers together, it is almost impossible to factor the product without knowing the two factors to begin with. Yes, it is possible to decode them:
(1) Know the correct factors to begin with
(2) Use very, very powerful computer for a very, very long time.
 
  • #3
Well, it can be cracked, but there's no smooth way to do it.
If there were, http://www.rsa.com/rsalabs/node.asp?id=2092 wouldn't give out $30,000 to the one who factors a number of "just" 212 decimal digits (and $200,000 for a 600+ digit number) :)
 
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  • #4
"RSA-640 is factored!

The factoring research team of F. Bahr, M. Boehm, J. Franke, T. Kleinjung continued its productivity with a successful factorization of the challenge number RSA-640, reported on November 2, 2005. The factors [verified by RSA Laboratories] are:

16347336458092538484431338838650908598417836700330
92312181110852389333100104508151212118167511579

and

1900871281664822113126851573935413975471896789968
515493666638539088027103802104498957191261465571

The effort took approximately 30 2.2GHz-Opteron-CPU years according to the submitters, over five months of calendar time. (This is about half the effort for RSA-200, the 663-bit number that the team factored in 2004.)
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Remember what HallsofIvy was just saying XD
 

Related to Decoding Secret Credit Card Numbers & Phone Recharge Codes

1. What is the purpose of decoding secret credit card numbers and phone recharge codes?

The purpose of decoding secret credit card numbers and phone recharge codes is to uncover hidden information about these codes, such as the card issuer, expiration date, and security code, which can be used for fraudulent activities. Decoding these codes can also reveal the recharge amount and validity period for phone recharge codes.

2. Is it legal to decode secret credit card numbers and phone recharge codes?

No, it is not legal to decode secret credit card numbers and phone recharge codes without proper authorization. This is considered identity theft and fraud, and can result in severe legal consequences.

3. Can anyone decode secret credit card numbers and phone recharge codes?

No, only individuals with specialized knowledge and skills, such as hackers or computer experts, can decode secret credit card numbers and phone recharge codes. It is not a simple task and requires a deep understanding of encryption and coding techniques.

4. How can I protect myself from having my credit card number or phone recharge code decoded?

To protect yourself, it is important to keep your credit card information and phone recharge codes safe and secure. This includes not sharing them with anyone, regularly monitoring your credit card and phone activity, and using strong and unique passwords for all online accounts.

5. Are there any legitimate reasons for decoding secret credit card numbers and phone recharge codes?

Yes, there are legitimate reasons for decoding these codes, such as for research purposes or for law enforcement to investigate fraudulent activities. However, proper authorization and ethical considerations must be taken into account before attempting to decode these codes.

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