Despite a rise in credit card cheat, the most com- monly-used PIN is still 1234, with 1111 and 0000 com- ing 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 at- tempt 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 eas- ier for hackers to guess a code simply by finding out a person＇ s age from online accounts.
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