That Figure Jumps To 25 Years

New estimates from a security researcher suggest GrayKey, a digital forensics tool in active use by U.S. Apple's standard six-digit iPhone passcode in an average of 11 hours. Longer codes, however, could take years to process. Here's how to beef up your handset's security. According to his calculations, Green estimates a six-digit passcode takes up to 22.2 hours to break, while processing an 8-digit code can take as few as 46 hours or up to 92 days.

That figure jumps to 25 years, or 12 years on average, for strong 10-digit passcodes made up of random numbers. Green published the estimates in a tweet picked up by Motherboard on Monday. Notably, Green's estimates are much faster than those reached in previous reports, which guessed a six-digit passcode would take "days" to crack.

The latest assessment assumes GrayKey uses an exploit that bypasses Apple's built-in security protections. Specifically, iOS delays multiple incorrect passcode attempts in a bid to thwart brute force attacks. These pauses are enabled after four consecutive attempts and run from one minute for a fifth unsuccessful attempt to one hour for the ninth consecutive error.

Further, users can elect to wipe their iPhone's data after ten consecutive failed attempts. GrayKey seemingly bypasses this failsafe, as well. As suggested in previous reports, GrayKey developer Grayshift is thought to rely on an undisclosed iPhone jailbreak or zero-day exploit to achieve the relatively quick turnover. If you are currently operating an iPhone or iPad without a passcode, navigate to Face ID & Passcode or Touch ID & Passcode in the Settings app and select Turn Passcode On.

You will be presented with an option to enter a six-digit passcode, but that option is made less secure with tools like GrayKey. Instead, select the Passcode Options link to enter a custom numeric code or custom alphanumeric code. As noted by Green, an 8-digit code now offers a moderate level of security, while 10-digit codes provide even stronger protection. Alphanumeric passwords with random letter, number and symbol combinations typically provide the highest level of security. Enter your new passcode or password into the box and reconfirm on the next screen to activate.

Enter your passcode once more to reveal a passcode settings screen, then select Passcode Options. Choose either Custom Alphanumeric Code or Custom Numeric Code and plug in your desired passcode. Re-enter the code on the next screen to activate. OS presents the option to Erase Data, which wipes an iPhone or iPad after ten failed attempts. Enabling Erase Data might not protect against GrayKey intrusions, as the tool's mechanics are thought to bypass the token-based functionality. For common brute force attacks, however, we recommend switching this function on if your device contains sensitive information.

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