Download PDF by Chey Cobb: Cryptography For Dummies

By Chey Cobb

ISBN-10: 0764541889

ISBN-13: 9780764541889

  • Cryptography is the simplest technique to in attaining facts defense and is vital to e-commerce actions resembling on-line buying, inventory buying and selling, and banking
  • This necessary advent to the fundamentals of encryption covers every thing from the terminology utilized in the sphere to precise applied sciences to the professionals and cons of other implementations
  • Discusses particular applied sciences that comprise cryptography of their layout, resembling authentication equipment, instant encryption, e-commerce, and clever cards
  • Based fullyyt on real-world concerns and occasions, the fabric presents directions for already on hand applied sciences that readers can placed to paintings immediately
  • Expert writer Chey Cobb is retired from the NRO, the place she held a most sensible mystery safety clearance, prompt staff of the CIA and NSA on computing device protection and helped enhance the pc defense guidelines utilized by all U.S. intelligence agencies

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Extra resources for Cryptography For Dummies

Example text

For now, though, I’m going to keep focused on ciphers and discuss some of the common cipher types. What Makes a Cipher? Over the ages there have been as many ways to hide and change data as there have been changes in clothing fashions. Likewise, some of these ciphers have fallen out of fashion while others have become classics. Generally, ciphers are much simpler forms of algorithms than we use today. Many of these early ciphers were very easy to crack. In today’s algorithms, we use the principles of these early ciphers, but much complexity has been added to make them harder to crack.

Secondly, because the next set of seven characters is always the same set of characters, hackers know they can just throw that portion away and concentrate on the first seven characters. Thirdly, the algorithm that Windows uses to encrypt the character is extremely weak and any password cracker worth its salt can crack them in no time. Windows, by default, stores your password both in the LANMAN method and a stronger encryption method. Hackers don’t have to bother much with the stronger stored version since the LANMAN is so easily cracked.

Again, SSL doesn’t actually provide the encryption; it just makes it possible for encryption to be used. SSL has become sort of a de-facto standard, and all Web browsers and servers are capable of using it. There are two levels of encryption available: 40-bit and 128-bit. The bit is the size of the key and, — and I’ll keep harping about this — the longer the key, the better the security. SSL and S-HTTP have very different designs and goals, so it is possible to use the two protocols together — and some merchants and banks do use both.

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Cryptography For Dummies by Chey Cobb


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