June 21, 2021


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Security Engineering: A Guide to Building Dependable Distributed Systems

The idea that Colonial would shut the pipeline down if it can't
measure who is getting what product (as I understand the story) sounds very
much like the apocryphal story about telephone exchanges (Central Offices or
Switches to some) back in the day: What is the purpose of a telephone
exchange?  “Why, to make telephone calls, of course!''
But that is not the answer. The true answer is: to generate billing records.
If the hard disk to which billing records are written is full, should the
exchange place calls?