Re:How secure is merely TRIMing all of a SSD's blocks?
by kryps on Wednesday March 08, 2023 @10:11AM
(#35069915)
The paper does not make that claim. According to the paper the probability of recovering the correct value of a single bit is 96% for a pristine drive and 56% for a used drive, both better than a coin toss. Of course the probability gets worse if one tries to recover more bits (but still better than n coin tosses for n bits).
Re:How secure is merely TRIMing all of a SSD's blocks?
by marginalia_nu on Wednesday March 08, 2023 @10:16AM
(#35069981)
Right, if you flip a hundred coins, about half of them land heads and the other half tails. The correct coins we'll call oracles, and the incorrect ones liars.
Now you perform a hdd recovery that is successful 70% of the time. That is still worse than the performance of the oracle coins which were correct, and if you invert the performance of the liars, they also beat the performance of the recovery.
If you have two coins, one which is always correct and one which is always incorrect, you can flip one of them to decide whether the other one is correct (and pick the opposite).
Check mate, statisticians!
> That is, if you toss a coin, you have a 50% chance of correctly choosing the value. In many instances, using a MFM to determine the prior value written to the hard drive was less successful than a simple coin toss.
More believably, the paper was written by Dr Craig Wright.