Download PDF by John E. Canavan: The Fundamentals of Network Security

By John E. Canavan

Many books specialise in one working method whilst contemplating community protection. John E. Canavan's reference paintings covers rules and functional functions that may be used with all working platforms.

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The following sections describe some of the more widely used techniques employed in breaking ciphers. Known Plaintext Attack This method relies on the code breaker knowing in advance the plaintext content of a ciphertext message. Having both the plaintext and the ciphertext the code breaker reengineers the cipher and the key used to create the ciphertext. Chosen Plaintext Attack This method relies on the ability of the code breaker to somehow get a chosen plaintext message encrypted. During World War II the United States used a variation of this method to ascertain the plans of the Japanese navy in the Pacific.

4: Asymmetric key encryption. With the aid of public key cryptography, it is possible to establish secure communications with any individual or entity when using a compatible software or hardware device. For example, if Alice wishes to communicate in a secure manner with Bob, a stranger with whom she has never communicated before, Alice can give Bob her public key. Bob can encrypt his outgoing transmissions to Alice with Alice's public key. Alice can then decrypt the transmissions using her private key when she receives them.

Unlike real hacking, denial-of-service attacks do not require a great deal of experience, skill, or intelligence to succeed. As a result, they are usually launched by nerdy, young programmers who fancy themselves to be master hackers. There are many different types of denial-of-service attacks. The following sections present four examples: ping of death, "synchronize sequence number" (SYN) flooding, spamming, and smurfing. These are examples only and are not necessarily the most frequently used forms of denial-of-service attacks.

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