icloud secure?
Its as secure as any service that holds the keys for you.
I give noone a 10.
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I give 1Password a 9(very good) because holding the sole key is such a critical detail. Missed a 10 because is subject to brute force attack.
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Post two-factor fix for iCloud. I give all the proprietary, two-factor lockers, which maintain a duplicate set of keys and access an 8 (good).
iCloud, Microsoft OneDrive, DropBox. Some banks with such like Chase.
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A 7(passing grade, barely) to Google/GMail/Drive.
Because we are their product and sold to their corporate customers. And they openly scan the contents we store in their cloud.
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Some banks like CapitalOne that don't have two-factor auth. But at least have a reverse lookup image to recognize. I give a 5(needs desperate improvement).
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If the site at least as strict requirements. 10+ characters, upper, lower, and number checking and supports symbols. A 3(embarrassing).
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Macrumors with no password requirements, and flaky vBul codebase a 1(wtf).