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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)

Directory services are physically distributed but logically centralized In other words, directories sit on machines in various areas of the network topology, but the directories contain a common set of information The network thus gains the intelligence on where resources are located, how they can be used, and who may use them If directory services were held in a physically centralized store, they would be harder to find and slower to use, and would generate unacceptable levels of network overhead traffic Further distinguishing them from other types of data stores, directories work best with data that changes infrequently For example, network management systems using the SNMP protocol like to take updates every five minutes or so, on such metrics as "packets per second" and the like By contrast, directories work best with data elements that are updated every day or so An example of this would be Cisco's CDS taking in new QoS policies from a network manager on a weekly basis Even a hierarchical directory is relatively flat and, therefore, no substitute for a database Directories don't have relational data structures, don't support transaction semantics or stored procedures, can't do two-phased commits, don't support a sophisticated query language such as SQL, and don't have integral reporting capability Without the room to store large objects such as BLOBs (binary large objects), directories aren't a good substitute even for a robust file system Last, directories lack the support for connectionless transport that DNS has, and are not seen as a potential replacement for DNS the world's largest distributed database

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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

What DEN does do is define a base schema of classes for the types of things that appear in network directories This alone is evidence that, while not itself a technology, DEN is nonetheless an undertaking of great scope Not only must it provide a taxonomic structure that captures all data stored in the various directories security data for RADIUS, domain-to-IP address mappings for DNS, and so on but DEN must do so in a way that accommodates the subtle differences in each vendor's implementation of services in its own products In other words, DEN must provide a directory namespace sufficiently broad and accurate to handle the stable of network directory services as they now exist