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How can a timing/cache side-channel attack be performed? How can attack know the time of which certain instructions are performed by the victim?

Çağlar Arlı      -    5 Views

How can a timing/cache side-channel attack be performed? How can attack know the time of which certain instructions are performed by the victim?

About timing my question is:

How can attack know the time of which certain instructions are performed by the victim?

And about the cache, how can attacker know which cache line is being accessed by the victim? Is this doable in "normal" PC? Actually, I think cache side-channel attack is performed through a time side-channel attack by understanding if an instruction has been executed or not by checking the cache fetching timing (the more time the more away is the cache (L2,L3) and the more unlikely is that the particular instruction was executed)...

but again the question is: how can an attacker observe this? How can attacker observe the cache access time of a particular process run by the victim?