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23
votes
7answers
8k views

How to prevent cheating (extra votes) in online contests?

Mitigating Cheating & Voter Fraud in Online Contests… We run online contests of various sorts that involve users voting on entries (usually one vote per user per day). The prizes range from ...
47
votes
5answers
24k views

What's the impact of disclosing the front-face of a credit or debit card?

There are quite a few cases where people are called out for disclosing the front-face of a credit or debit card (e.g. this tweet from Brian Krebs or this twitter account). So I was wondering what the ...
7
votes
5answers
2k views

Preventing online voter fraud

As part of a promotional campaign, my company wants to launch a site where users (and potential users) of our product will be required to register and vote for certain choices. Depending on how ...
46
votes
4answers
12k views

Detecting skimmers and other ATM traps

This question has been bothering me ever since I first heard of ATM skimmers: Instances of skimming have been reported where the perpetrator has put a device over the card slot* of an ATM ...
8
votes
5answers
18k views

How is Chase Mobile Deposit Secure?

Chase has this app that allows you to snap a picture of a check with your phone and deposit that check into your account. How do they prevent: Someone from depositing a check that's not written to ...
2
votes
2answers
130 views

ATM skimming with magnetic stripe

I have a question about ATM skimming. If ATMs in the UK still accept magnetic stripe can't a thief still use a cloned card at the ATM to withdraw money?
22
votes
4answers
43k views

What is the use of stolen credit card details?

What can a person with stolen credit card details do? Buy porn? Buy tons of server resources to perform an attack? What else? I'm sure that if he buys books, shoes and bicycles or transfer funds ...
4
votes
3answers
4k views

How can I prevent my E-mail address from being used as the sender for fraudulent/scam messages?

Recently, me and at least one other person I know received an obvious scam E-mail that starts off something like this: We considered your resume to be very attractive and we thought the vacant ...
7
votes
4answers
445 views

Candidate authentication in large scale assessment

First of all, I'd like to apologize beforehand if the questions I am about to ask are not really suitable for this site. I could not think of any other category to post under. Right, here goes. We're ...
3
votes
1answer
251 views

Fraud Mitigation - Card Present Transactions

When it comes to fraud screening for card not present transactions (credit card / debit card) there are a number of techniques / services that can be utilized to mitigate risks from fraudulent ...
8
votes
2answers
530 views

Are social security numbers useless by themselves?

If 453.7 million social security numbers have been issued to date. And there are only 1 billion = 1000 million distinct 9 digit integer pairs. Then that means if I were to make up any 9 digits, that ...
4
votes
1answer
80 views

Countermeasures for a family-member attack on a password reset procedure

Given an account reset procedures, there are usually some recovery questions, and in better implementations a link will be sent to confirm the password change via email or SMS. Therefore, the attacker ...
1
vote
1answer
274 views

“Inverted” asymmetric encryption

I am developing a system to prevent frauds in tickets. What do I need? An algorithm to generate a QR Code that will be shown to my clients in a ticket. An algorithm to validate (offline) the ...