A study from DataGenetics analyzing 3.4m 4-digit codes found that many of the high-frequency PINs could be interpreted as years of birth because many began with 19, making it easier for hackers to decode. The majority of PINs began with the number 1. The numbers 0 and 2 are also popular. As many as 1 in 6 people use their pet's name as a password.
科技公司数据基因在对340万个4位密码进行研究后指出，人们喜欢用自己的出生年份作为密码，所以以19开头的密码出现的频率非常高，也让黑客有了可乘之机。研究称，多数密码是以1开头，0和2也很受欢迎。此外，1/6的人会用宠物名字作密码。
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