Someone please explain the 4 thing as if I were a 10 year old.
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@EdibleFuchsia But seriously, a certificate authority called eMudhra had eight of its secret signing keys turn out to be tiny numbers. One was literally 4.
These keys should be numbers around 116 digits long, so nobody could ever guess them. Instead all eight were below 256, which means anyone could try every option in under a second and forge a trusted padlock for any website.
Browsers have now blocked them. But keep your devices updated, as older gadgets that rarely get patches are where the risk remains.
https://scotthelme.co.uk/eight-bits-of-trust-emudhras-ca-keys-cracked-in-milliseconds
@EdibleFuchsia It's like 6-7 but with a single number