Computer security attacks are frequent fodder for ethical analyses, but the ethics of computer security defenses are not often examined. We address this by considering a topical problem in computer security. In an age of so-called “advanced persistent threats” that lurk undetected on computer systems for long periods of time, it is increasingly unrealistic to expect a computer system to be permanently free of malicious software. Recognizing this, we posit the idea of a “cosecure system” - a cosecure system, by design, would allow legitimate software and malicious software to coexist safely on the same machine.
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