To access the Cryptography and Network Security: Principles and Practice, Sixth Edition, .. PDF files: Reproductions of all figures and tables from the book. Appendix A. Projects for Teaching Cryptography and Network Security .. PDF Files: Reproductions of all figures and tables from the book. • Test Bank: A. PDF | Cryptography will continue to play lead roles in developing new This book discusses some of the critical security challenges faced by.
|Language:||English, Spanish, Arabic|
|ePub File Size:||23.34 MB|
|PDF File Size:||19.25 MB|
|Distribution:||Free* [*Register to download]|
Cryptography and Network Security Principles and Practices, Fourth Edition .. sites, transparency masters of figures and tables in the book in PDF (Adobe. OBJECTIVES It is the purpose of this book to provide a practical survey of both the principles and practice of cryptography and network security. In the first part of . modeling excellence; I believe that this interest can lead to total culture change for the. Neuro linguistic programmi Cryptography and Network Security.
In an age of viruses and hackers, electronic eavesdropping, and electronic fraud on a global scale, security is paramount. The purpose of this book is to provide a practical survey of both the principles and practice of cryptography and network security. In the first part of the book, the basic issues to be addressed by a network security capability are explored by providing a tutorial and survey of cryptography and network security technology. The latter part of the book deals with the practice of network security: practical applications that have been implemented and are in use to provide network security. The Seventh Edition streamlines subject matter with new and updated material - including Sage, one of the most important features of the book. Sage is an open-source, multiplatform, freeware package that implements a very powerful, flexible, and easily learned mathematics and computer algebra system.
As shown in Figure 3, a Feistel cipher combines elements of substitution, permutation transposition , and key expansion; these features create a large amount of " confusion and diffusion " per Claude Shannon in the cipher.
One advantage of the Feistel design is that the encryption and decryption stages are similar, sometimes identical, requiring only a reversal of the key operation, thus dramatically reducing the size of the code software or circuitry hardware necessary to implement the cipher. One of Feistel's early papers describing this operation is " Cryptography and Computer Privacy " Scientific American, May , 5 , Block ciphers can operate in one of several modes; the following are the most important: Electronic Codebook ECB mode is the simplest, most obvious application: the secret key is used to encrypt the plaintext block to form a ciphertext block.
Two identical plaintext blocks, then, will always generate the same ciphertext block. ECB is susceptible to a variety of brute-force attacks because of the fact that the same plaintext block will always encrypt to the same ciphertext , as well as deletion and insertion attacks.
In addition, a single bit error in the transmission of the ciphertext results in an error in the entire block of decrypted plaintext. Cipher Block Chaining CBC mode adds a feedback mechanism to the encryption scheme; the plaintext is exclusively-ORed XORed with the previous ciphertext block prior to encryption so that two identical plaintext blocks will encrypt differently. While CBC protects against many brute-force, deletion, and insertion attacks, a single bit error in the ciphertext yields an entire block error in the decrypted plaintext block and a bit error in the next decrypted plaintext block.
Cipher Feedback CFB mode is a block cipher implementation as a self-synchronizing stream cipher. CFB mode allows data to be encrypted in units smaller than the block size, which might be useful in some applications such as encrypting interactive terminal input. If we were using one-byte CFB mode, for example, each incoming character is placed into a shift register the same size as the block, encrypted, and the block transmitted. At the receiving side, the ciphertext is decrypted and the extra bits in the block i.
CFB mode generates a keystream based upon the previous ciphertext the initial key comes from an Initialization Vector [IV]. In this mode, a single bit error in the ciphertext affects both this block and the following one. Output Feedback OFB mode is a block cipher implementation conceptually similar to a synchronous stream cipher. OFB prevents the same plaintext block from generating the same ciphertext block by using an internal feedback mechanism that generates the keystream independently of both the plaintext and ciphertext bitstreams.
In OFB, a single bit error in ciphertext yields a single bit error in the decrypted plaintext.
Counter CTR mode is a relatively modern addition to block ciphers. Unlike ECB, however, CTR uses different key inputs to different blocks so that two identical blocks of plaintext will not result in the same ciphertext. Finally, each block of ciphertext has specific location within the encrypted message. DES is a Feistel block-cipher employing a bit key that operates on bit blocks. DES has a complex set of rules and transformations that were designed specifically to yield fast hardware implementations and slow software implementations, although this latter point is not significant today since the speed of computer processors is several orders of magnitude faster today than even twenty years ago.
DES was based somewhat on an earlier cipher from Feistel called Lucifer which, some sources report, had a bit key. This was rejected, partially in order to fit the algorithm onto a single chip and partially because of the National Security Agency NSA. By combining 64 additional key bits to the plaintext prior to encryption, effectively increases the keylength to bits.
The algorithm can use a variable block length and key length; the latest specification allowed any combination of keys lengths of , , or bits and blocks of length , , or bits. They, too, have approved a number of cipher suites for various applications. Also available internationally. RC1: Designed on paper but never implemented.
It's code has not been made public although many companies have licensed RC2 for use in their products. Described in RFC RC3: Found to be breakable during development. RC4: A stream cipher using variable-sized keys; it is widely used in commercial cryptography products. More detail about RC4 and a little about Spritz can be found below in Section 5. RC5 : A block-cipher supporting a variety of block sizes 32, 64, or bits , key sizes, and number of encryption passes over the data.
Key lengths can vary from 32 to bits in length. Twofish : A bit block cipher using , , or bit keys.
Conditioning and health testing for true random number generators provides coverage of these important topics in Chapter 8. The user authentication model in Chapter 15 includes a new description of a general model for user authentication, which helps to unify the discussion of the various approaches.
The material on cloud security in Chapter 16 is updated and expanded in the new edition to reflect its importance and recent developments. It now includes a discussion of the new TLS version 1. The Seventh Edition offers a tremendous amount of original supporting material for students online at two Web locations: The Companion Web site, at WilliamStallings.
The download of this textbook also grants access to the Premium Content site for six months. It includes the following materials: Online chapters: To limit the size and cost of the book, four chapters of the book are provided in PDF format. This includes three chapters on computer and one on legal and ethical issues.
Online appendices: There are numerous interesting topics that support material found in the text but whose inclusion is not warranted in the printed text.
A total of 20 online appendices cover these topics for the interested student. Homework problems and solutions: To aid the student in understanding the material, a separate set of homework problems with solutions are available. Key papers: A number of papers from the professional literature, many hard to find, are provided for further reading. Supporting documents: A variety of other useful documents are referenced in the text and provided online.
Sage code: The Sage code from the examples in Appendix B is useful in case the student wants to play around with the examples. The text is accompanied by the following supplementary material to aid instruction: Solutions manual: Solutions to all end-of-chapter Review Questions and Problems.
CSE Computer Security. Includes lecture notes. U of Michigan. On-line presentation slides. At George Mason U. Includes list of projects and laboratory exercises. CS Cryptography. At Boston University.
At U of Maryland. If you have any suggestions for site content, please contact me at. In particular, please pass along links to relevant web sites and links to course pages used by instructors teaching from this book. Comprehensive set of links to sites related to cryptography and network security.
Lengthy and worthwhile FAQ covering all aspects of cryptography. Tom Dunigan's Security Page: An excellent list of pointers to cryptography and network security web sites. Home of the electronic newsletter Cipher, which provides book reviews, new crypto and security links, and links to reports and papers available online.
Computer Security Resource Center: Maintained by NIST; contains a broad range of information on security threats, technology, and standards. Computer and Network Security Reference Index: A good index to vendor and commercial products, FAQs, newsgroup archives, papers, and other Web sites.
SNMPv3 Security: My paper, "SNMPv3: AES Home Page: MIT Kerberos Site: Information about Kerberos, including the FAQ, papers and documents, and pointers to commercial product sites. Another good source of Kerberos material. Public-Key Infrastructure Working Group: