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Despite a rise in credit card cheat, the most commonly-used PIN is still 1234, with 1111 and 0000 coming in second and third.
A study by Data Genetics has discovered that one in ten codes is so obvious it would take criminals just one attempt to guess it correctly, while more than a quarter of the codes are used so often they can be guessed in fewer than 20 attempts. The study from Data Genetics analysed 3.4 million four-digit（四位数） codes and found that many people use birth years as PINs, making it even easier for hackers to guess a code simply by finding out a person’s age from online accounts.
Research from security expert McAfee has found that 17 per cent of people in Europe have been victims of credit card cheat, at a cost of ￡1,076 per person.
Last year the total cost of credit card cheat in the UK from criminals hacking and cloning cards was ￡42.1 million and the total amount of cheat committed through all credit card-related crimes was ￡388 million.
There are 10,000 possible combinations for four-digit PIN codes using 0 to 9. They discovered that all of the possible 10,000 combinations — from 0000 to 9999 — were found in the data list. The most popular password was 1234, but the amount of times this number occurred shocked the researchers — almost 11 per cent of the 3.4 million passwords were 1234. This PIN was also more popular than the 4,200 codes at the bottom of the list combined. The next most popular four-digit PIN was 1111, used more than 6 per cent of times. In third place was 0000 at two per cent.
Data Genetics worked out a list of the top 20 passwords and found that 26.83 per cent of all the passwords in the list could be guessed by attempting these 20 combinations.
The more popular password selections ruled the frequency tables and the study found that 10 per cent of PINs could be guessed correctly first time. More than 20 per cent could be guessed by using just five attempts and statistically, one third of all codes could be guessed by trying just 61 distinct combinations.
The data found that the least-used code was 8068 with just 25 appearances in 3.4 million — far fewer than random distribution would predict. The researchers also noted that many of the high-frequency PINs could be fixed as years because many began with 19. This could be a birth year or anniversary and if a hacker can guess someone’s age, or even obtain it through birth records or online accounts, for example, they could make an educated guess at the PIN.
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