New iPhone And Android Warning — Do Not Use These PIN Numbers

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New iPhone And Android Warning — Do Not Use These PIN Numbers
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Your smartphone PIN could be cracked in less than a second — don’t ignore this iPhone and Android warning.

Update, May 20, 2025: This story, originally published May 19, has been updated with more information surrounding the secure use of smartphone lock screen PIN numbers following the iPhone and Android warning regarding the ability of AI to quickly crack specific PIN structures, including 10 numbers you must never use.

You do, of course, activate your smartphone lock screen. Right? I mean, it’s the first thing anyone who really cares about the security of their device and the data that is accessed using it does when getting a new phone. That should be a given, with either a fingerprint or face scan required to unlock it to add that essential primary level of device protection against casual thieves, nosey family members or work colleagues.

Jaanus Rõõmus, the head of technology and engineering at Messente, has warned that because PIN codes use a structural approach to categorization, some are much riskier to use than others. “PINs with the same digits are the worst,” Rõõmus said, “as they can be easily cracked by AI in 0.44 seconds on average.” Which, as the report pointed out, is actually quicker than the time it takes for your iPhone or Android to unlock.

A repeated set of four digits isn’t the only risky PIN behavior you participate in, though. Rõõmus said the research found that consecutive numbers, using pairs and patterns, and anything resembling a date are abysmal choices. “The fact that AI can crack commonly used PINs should be a major wake-up call for both individuals and businesses,” Uku Tomikas, the Messente CEO warned. “Change your PIN now if you have any of these sequences in your passcode to protect your information.

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