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“You’re not totally naked in the world,” cryptologist Jon Graff reassured his audience at SD West 2005, “you’re wearing a towel.” By the time that Graff finished his day-long tutorial, “A Lucid and Easily Understood Explanation of Modern Cryptography,” on Monday, March 14, he had shocked attendees by pointing out that even using an ATM can be a minefield of security holes—but he’d also equipped them with mine detectors in the form of a solid grounding in today’s crypto.
Graff, head of architecture in Nokia’s Enterprise Solutions group, knows that cryptology is vital, yet insufficient on its own. “Cryptology definitely does not solve all the world’s problems—except when you’re selling it to a customer,” he quipped. He explained that attention must be paid to technical cryptographic strength, but that’s not enough. Cryptosystems like the Data Encryption Standard (DES)—long sanctioned by the
Because of the economics of security and the inertia of already deployed systems, even your car and your cell phone aren’t safe: Bluetooth networking uses only a 40-bit key, which can be cracked by brute force in minutes by a laptop computer. “This is a good example,” said Graff, “of why you can’t layer security on after the fact—it has to be designed in from the first. Security is a way of making things not happen, so if you put it in afterwards, things break.”
Graff went beyond the horror stories into crypto’s inner workings. Crypto has a reputation for fearsome complexity, but Graff led the class bit by bit through the arcana, delivering it in chunks small enough to be digested by “mathematically perplexed people.” Starting with symmetric-key encryption, he showed how key exchange rapidly escalates to a huge problem as the number of communicating entities increases, then elucidated the Kerberos system as a clever solution to the problem. After that, it was on to the mysteries of public-key cryptosystems and the internals of technologies like Secure Sockets Layer (SSL), which many use but few comprehend—unless they’ve attended Graff’s class.
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