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CHAPTER 3 Psychology and Usability

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Humans are incapable of securely storing high-quality cryptographic keys, and they have unacceptable speed and accuracy when performing cryptographic operations. (They are also large, expensive to maintain, difficult to manage, and they pollute the environment. It is astonishing that these devices continue to be manufactured and deployed. But they are sufficiently pervasive that we must design our protocols around their limitations.)

– KAUFMANN, PERLMAN AND SPECINER [1028]

Only amateurs attack machines; professionals target people.

– BRUCE SCHNEIER

Metternich told lies all the time, and never deceived any one; Talleyrand never told a lie and deceived the whole world.

– THOMAS MACAULAY

Security Engineering

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