Cryptography
The Key to Digital Security, How It Works, and Why It Matters
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- 12٫99 US$
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A “must-read” (Vincent Rijmen) nuts-and-bolts explanation of cryptography from a leading expert in information security.
Despite its reputation as a language only of spies and hackers, cryptography plays a critical role in our everyday lives. Though often invisible, it underpins the security of our mobile phone calls, credit card payments, web searches, internet messaging, and cryptocurrencies—in short, everything we do online. Increasingly, it also runs in the background of our smart refrigerators, thermostats, electronic car keys, and even the cars themselves. As our daily devices get smarter, cyberspace—home to all the networks that connect them—grows.
Broadly defined as a set of tools for establishing security in this expanding cyberspace, cryptography enables us to protect and share our information. Understanding the basics of cryptography is the key to recognizing the significance of the security technologies we encounter every day, which will then help us respond to them.
What are the implications of connecting to an unprotected Wi-Fi network? Is it really so important to have different passwords for different accounts? Is it safe to submit sensitive personal information to a given app, or to convert money to bitcoin? In clear, concise writing, information security expert Keith Martin answers all these questions and more, revealing the many crucial ways we all depend on cryptographic technology. He demystifies its controversial applications and the nuances behind alarming headlines about data breaches at banks, credit bureaus, and online retailers. We learn, for example, how encryption can hamper criminal investigations and obstruct national security efforts, and how increasingly frequent ransomware attacks put personal information at risk. Yet we also learn why responding to these threats by restricting the use of cryptography can itself be problematic.
Essential reading for anyone with a password, Cryptography offers a profound perspective on personal security, online and off.
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Martin (Everyday Cryptography), an information security scholar, provides a useful introduction to cryptography, successfully showing the field isn't one "only computer whiz kids have any hope of understanding." Underlining cryptography's importance, he observes that digital encryption "underpins everyone's security in cyberspace," from online shopping to keyless car entry. Starting at the most basic level of computer science, Martin explains how binary code works, before moving to more advanced topics such as symmetric encryption and hash functions. He shows a knack for communicating demanding ideas, breaking up the text into short chunks, echoing the structure of block cipher and with the same result of facilitating quick deciphering of sometime complex information. He also deploys physical metaphors for the abstract cryptographic tools he covers, describing asymmetric encryption, for instance, as a series of padlocks attached to a briefcase, and the challenge-response principle as a blind boomerang hunter. For historical context, Martin connects today's encryption techniques to codes used by the likes of Julius Caesar and Mary, Queen of Scots. At the close, he discusses the difficult balancing act between security and personal privacy, and likely future developments in the cryptographic field. This timely book will leave digital neophytes significantly better informed about a vital area in computer science.
