[ClassyJacket]

Nope, the chance of success for each attempt went from 1 in 18,000,000,000,000,000,000 to 2 in 18,000,000,000,000,000,000.

[talaketu]

that's from theoretically possible to theoretically possible.

[Spare_account]

Which is grammatically consistent with the assertion that fundamentally nothing has changed: certificates with a 63-bit serial number are unlikely to be compromised and certificates with a valid 64-bit serial number are also unlikely to be compromised.

[Cthulhu_]

Not 1 in 18 quintillion to 1 in 9 quintillion? I think you've got your binary math wrong.

[matmg]

2/18000000000000000000 == 1/9000000000000000000

[ClassyJacket]

2/18 and 1/9 are equal.