Reply to post: "One must ask why data in caches is in the clear"

Meltdown, Spectre: The password theft bugs at the heart of Intel CPUs

Anonymous Coward
Anonymous Coward

"One must ask why data in caches is in the clear"

Read about "side channel attacks". Data in the cache is not read directly - some clever techniques - i.e. timing how long it takes to perform an operation after bringing into cache some specific addresses with specific bits set - are used to "read" it, maybe one bit per operation, but with enough time available, you can read a lot of data.

And anyway, at some point *any* data must be in the clear to be operated upon. Here you're in the cache close and designed to let the CPU process data at full speed...

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