Titlebook: Beyond Fear; Thinking Sensibly Ab Bruce Schneier Book 2003 Springer Science+Business Media New York 2003 Internet.Security.authentication.c

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metropolitan

PURG

adjacent

Systems and How They Failed, and the surrounding environment. These interactions affect security in a profound way. They are the points at which the system fails when attacked, and they are the points where the system fails even in the absence of attackers. Because security systems are designed to prevent attack, . the syst

enmesh

Knowing the Attackers—each requires a different approach to security. Will the attackers be skilled professionals? How well funded are they? How averse to risk? Will they be motivated by money, or an ideology, or even a personal grudge? Are they outside burglars, employees, or friends and relatives? None of these questi

CODE

Attackers Never Change Their Tunes, Just Their Instruments stealing, and fraud is fraud. But even as the fundamental goals and motivations of attackers remain constant, the tools and techniques of attack change. A single attacker can undertake many different attacks, and a single type of attack can usually be launched by a number of different attackers. Ea

Expiration

Technology Creates Security Imbalancesarty or the other, and new attacks may be possible against technologically advanced systems that were not possible against older, simpler systems. Concepts such as automation, class breaks, and action at a distance also increase threats by giving attackers more leverage; and the sheer complexity of

積習難改

Security Is a Weakest-Link Problemour likely attackers: What’s the weakest link for a suicide bomber will be different from the weakest link for a petty burglar. All systems have a weakest link, and there are several general strategies for securing systems despite their vulnerabilities. . ensures that no single vulnerability can com

Mettle

Brittleness Makes for Bad Securityresilient. A resilient system is dynamic; it might be designed to fail only partially, or degrade gracefully; it might adjust to changing circumstances. In general, automated systems—which do one thing very well, but only one thing—are brittle. They don’t react well to partial failures, unforeseen a

FLING