Given Information: Each block cipher T i reverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m th bit is equal to the input value of the m th bit. Example: “11110000” becomes “00001111”. Block Cipher: A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

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Answer 1

Question

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Expert Solution & Answer

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Students have asked these similar questions

a. Compute CBC-MAC for a message of 16 bits, “8642” (in Hexa). Assume a block size of 8 bits with an IV=F1 (in hexa). For simplicity, assume the encryption to be a simple XOR of the key with the plaintext. Let the encryption key be B4 (in Hexa). (Hint: Divide the message into blocks of 8 bits each; XOR each block with the previous cipher output; then encrypt this with the key. For the first block, XOR it with IV. Details in pages 325-326 Ch.12 of the textbook) b. Suppose Alice computes the Secret prefix MAC (page 322: secret prefix MAC(x) = h(key || x)) for the message ”AM” (in ASCII) with key “G” (in ASCII) that both Alice and Bob know. The hash function that is used is h(x1x2x3)= g(g(x1 XOR x2) XOR x3 ) where each xi is a character represented as 8 bits, and g(x) is a 8-bit string that is equal to the complement of bits in x. For example, g(10110011) = 01001100. The MAC is 8 bits. (8-bit ASCII representation of the characters is given below.) What is the Secret prefix MAC…

The very first step in the SHA1 algorithm is to pad the message so that it is a multiple of 512 bits. This padding occurs as follows (from NIST FPS 180-2): Suppose the length of the message M is L bits. Append bit 1 to the end of the message, followed by K zero bits where K is the smallest non-negative solution to L+1+K 448 (mod 512). Next append a 64-bit block that is a binary representation of the length integer L. For example, Message = “abc” length L = 24 bits 001100001 01100010 01100011 1 00……000 00…011000 a b c <---423---> <---64----> <-------------------512------------------------------>. Why do we include the length of the message in the calculation of the hash code?

00010280000000000000000000000000 This answer is not correct. Please give correct answer

Answer 2

Question

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Expert Solution & Answer

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Answer 3

Question

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 5

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 6

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 7

Chapter 8, Problem P4P

a)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 8

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 9

b)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 10

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 11

c)

Program Plan Intro

Given Information:

Each block cipher T_ireverses the order of the eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m^th bit is equal to the input value of the m^th bit.

Example:

“11110000” becomes “00001111”.

Block Cipher:

A Block Cipher is a method of encrypting text in which a cryptographic key and algorithm are applied to blocks of data.

Answer 12

Expert Solution & Answer

Answer 13

Expert Solution & Answer

Answer 14

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Answer 15

Ch. 8 - Prob. R1RQ Ch. 8 - Prob. R2RQ Ch. 8 - Prob. R3RQ Ch. 8 - Prob. R4RQ Ch. 8 - Prob. R5RQ Ch. 8 - Prob. R6RQ Ch. 8 - Prob. R7RQ Ch. 8 - Prob. R8RQ Ch. 8 - Prob. R9RQ Ch. 8 - Prob. R10RQ

Solution Summary: The author explains that each block cipher reverses the order of eight input bits. The 64-bit scrambler does not modify any bits and hence the output value of the m th bit is equal to the input

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Chapter 8 Solutions