By David Salomon
Details an important strategies used to make the garage and transmission of information quickly, safe, and reliable.
obtainable to either experts and nonspecialists: Avoids complicated arithmetic
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Extra info for Coding for Data and Computer Communications
Generate the secret information to be used with the algorithm. 3. Develop methods for the distribution and sharing of the secret information. 4. Specify a protocol to be used by the two principals that makes use of the security algorithm and the secret information to achieve a particular security service. 2. However, there are other security-related situations of interest that do not neatly fit this model but are considered in this book. 3, which reflects a concern for protecting an information system from unwanted access.
1 / Symmetric Cipher Model 33 If the analyst is able somehow to get the source system to insert into the system a message chosen by the analyst, then a chosen-plaintext attack is possible. An example of this strategy is differential cryptanalysis, explored in Chapter 3. In general, if the analyst is able to choose the messages to encrypt, the analyst may deliberately pick patterns that can be expected to reveal the structure of the key. 1 lists two other types of attack: chosen ciphertext and chosen text.
This type of service supports applications like electronic mail, where there are no prior interactions between the communicating entities. 5 There is no universal agreement about many of the terms used in the security literature. For example, the term integrity is sometimes used to refer to all aspects of information security. The term authentication is sometimes used to refer both to verification of identity and to the various functions listed under integrity in this chapter. 800 and RFC 4949.