Quadruple Mirror - Five-Step Frame of Security and Tradeoffs (2003-2025)
Security decisions are not simply a series of countermeasures, but a cyclical thinking process that repeatedly examines five questions. Identify assets to protect, identify threats and vulnerabilities, reduce risk through countermeasures, identify new side effects, and calculate overall cost. This "five-step frame" illustrates the principle that a collection of partial optimizations does not lead to the overall optimization. Heavy authentication and stronger defenses increase security, but they can also undermine convenience and create other risks. Hence, security is always based on tradeoffs. This structure, which is similar to the five questions in Bruce Schneier's Beyond Fear, is a practical way of thinking, including cost-effectiveness, that many organizations still employ today. More recently, the Bayesian decision-making model has led to dynamic optimization, proposing a framework that adjusts flexibly in response to changes in risk. Security is the art of keeping the s
cales with reason, not fear, and protection is the art of constantly "thinking".
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