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1. A is an encryption/decryption scheme in which a block of plaintext is treated as a whole and used to produce a ciphertext block of equal length. seeks to make the relationship between the statistics of the ciphertext and the value of the encryption key as complex as possible so that even if the attacker can get some handle on the statistics of the ciphertext, the way in which the key was used to produce that ciphertext is so complex it is difficult to deduce the key. structure which consists of a number of 3. Many block ciphers have a identical rounds of processing and in each round a substitution is performed on one half of the data being processed, followed by a permutation that interchanges the two halves. 2.

1. A is an encryption/decryption scheme in which a block of plaintext is treated as a whole and used to produce a ciphertext block of equal length. seeks to make the relationship between the statistics of the ciphertext and the value of the encryption key as complex as possible so that even if the attacker can get some handle on the statistics of the ciphertext, the way in which the key was used to produce that ciphertext is so complex it is difficult to deduce the key. structure which consists of a number of 3. Many block ciphers have a identical rounds of processing and in each round a substitution is performed on one half of the data being processed, followed by a permutation that interchanges the two halves. 2.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. A is an encryption/decryption scheme in which a block of plaintext is treated as a whole and used to produce a ciphertext block of equal length. seeks to make the relationship between the statistics of the 2. ciphertext and the value of the encryption key as complex as possible so that even if the attacker can get some handle on the statistics of the ciphertext, the way in which the key was used to produce that ciphertext is so complex it is difficult to deduce the key. structure which consists of a number of 3. Many block ciphers have a identical rounds of processing and in each round a substitution is performed on one half of the data being processed, followed by a permutation that interchanges the two halves. 4. Feisteľ's is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and functions. 5. In the statistical structure of the plaintext is dissipated into long- range statistics of the ciphertext. This is achieved by having each plaintext digit affect the value of many ciphertext digits. 6. Two areas of concern regarding the level of security provided by DES are the nature of the algorithm and the. 7. The independently when any single input bit i is inverted for all i, j and k. - criterion states that output bits j andk should change 8. The, which, in turn, is based on Shannon's proposal of 1945, is the structure used by many significant symmetric block ciphers currently in use. cipher structure, which dates back over a quarter century and 9. The cryptographic strength of a Feistel cipher derives from three aspects of the design: the function F, the key schedule algorithm, and
Transcribed Image Text:1. A is an encryption/decryption scheme in which a block of plaintext is treated as a whole and used to produce a ciphertext block of equal length. seeks to make the relationship between the statistics of the 2. ciphertext and the value of the encryption key as complex as possible so that even if the attacker can get some handle on the statistics of the ciphertext, the way in which the key was used to produce that ciphertext is so complex it is difficult to deduce the key. structure which consists of a number of 3. Many block ciphers have a identical rounds of processing and in each round a substitution is performed on one half of the data being processed, followed by a permutation that interchanges the two halves. 4. Feisteľ's is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and functions. 5. In the statistical structure of the plaintext is dissipated into long- range statistics of the ciphertext. This is achieved by having each plaintext digit affect the value of many ciphertext digits. 6. Two areas of concern regarding the level of security provided by DES are the nature of the algorithm and the. 7. The independently when any single input bit i is inverted for all i, j and k. - criterion states that output bits j andk should change 8. The, which, in turn, is based on Shannon's proposal of 1945, is the structure used by many significant symmetric block ciphers currently in use. cipher structure, which dates back over a quarter century and 9. The cryptographic strength of a Feistel cipher derives from three aspects of the design: the function F, the key schedule algorithm, and
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