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Caesar ciphers are very easy to crack by using word patterns, frequency analysis, or brute force The code WKH shows up twice, which means it s the same word (word patterns) We also see the letters W and H show up fairly often Certain letters of the alphabet are used more than others, so a code-breaker can use that to help decrypt the code (frequency analysis) Assuming that you know this is a Caesar cipher, a computer can quickly go through every different code possibility and determine the answer (brute force) Incredibly, even though it s not as obvious, binary code also suffers from the same problem In computing you need to make a cipher hard for anyone to break except the people you want to read the data Luckily, computers do more complex algorithms very quickly (it s just math) and you can use longer keys to make the code much harder to crack Okay, let s take the information above and generate some more symbols to show this process When you run cleartext through a cipher algorithm using a key, you get what s called ciphertext (Figure 11-2)

#include <stdlibh> #include <stdioh> int main(void) { char num1[80], num2[80]; printf("Enter first: "); gets(num1); printf("Enter second: ");

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Over the years, computing people have developed hundreds of different complete algorithms for use in encrypting binary data Of these, only a few were or still are commonly used in the TCP/IP world The math behind all of these complete algorithms is incredibly complex, and way outside the scope of the CompTIA Network+ exam, but all of them have two items in common: a complex algorithm underlying the cipher, and a key or keys used to encrypt and decrypt the text Any encryption that uses the same key for both encryption and decryption is called symmetric-key encryption or a symmetric-key algorithm If you want someone to decrypt what you encrypt, you have to make sure they have some tool that can handle the algorithm and you have to give them the key This is a potential problem I will address later in this chapter

Page 446 gets(num2); printf(''The sum is: %ld", atol(num1)+atol (num2)); return 0; }

First-talker The first-talker rule is a variation on blocking in which a queue of resources that have requested the right to generate a media stream is maintained When the blocking resource stops generating its media stream, the next resource in the queue may begin Summing Conference port resources can accept media streams from multiple secondary resources simultaneously This is permitted by the summing arbitration rule The arbitration mechanism a given media service instance supports is implementation dependent, however the media client may request a particular arbitration rule if more than one is supported

#include <stdlibh> long long int atoll(const char *str);

Any encryption that uses different keys for encryption and decryption is called asymmetric-key encryption or an asymmetric-key algorithm Let s look at symmetric-key encryption first, then turn to asymmetric-key encryption

CT system accounting functions provide one or more of the following features: Call detail records that indicate what user (or device) made use of which service(s) or resource(s) and for how long Billing information that combines call detail records with pricing data This may be used for recovering or apportioning operating costs (in private networks) or for billing subscribers (in public networks)

atoll( ) was added by C99 The atoll( ) function converts the string pointed to by str into a long long int value It is otherwise similar to atoll( ) Related Functions atof( ), atoi( ), and atol( ) bsearch

There is one difference among symmetric-key algorithms Most algorithms we use are called block ciphers because they encrypt data in single chunks of a certain length at a time Let s say you have a 100,000-byte Microsoft Word document you want to encrypt One type of encryption will take 128-bit chunks and encrypt each one separately (Figure 11-3) Block ciphers work well when data comes in clearly discrete chunks Most data crossing wired networks comes in IP packets, for example, so block ciphers are very popular with these sorts of packets

#include <stdlibh> void *bsearch(const void *key, const void *buf, size_t num, size_t size, int (*compare)(const void *, const void *));

Credit tracking and reporting that uses billing information to debit a users account and cut off service when the account balance reaches a certain level This is used for pre-paid services Most systems provide call detail recording, or CDR, which refers to the ability to generate call detail records Conventional telephone systems traditionally deliver CDR information through a serial port A printer or a computer that records these records can then be attached to the serial port CT systems, particularly IP telephone systems, typically use the IP network to convey this information Unfortunately, there is no clear standard covering the content, structure, and mechanisms for delivering this information

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