Question: Consider a very simple symmetric block encryption algorithm, in which 64-bits blocks of plaintext are encrypted using a 128-bit key. Encryption is defined as C

Consider a very simple symmetric block encryption algorithm, in which 64-bits

Consider a very simple symmetric block encryption algorithm, in which 64-bits blocks of plaintext are encrypted using a 128-bit key. Encryption is defined as C = ( PK) K1 where C = ciphertext; K = secret key; K, = leftmost 64 bits of K; K1 = rightmost 64 bits of K, = bitwise exclusive or; and #is addition mod 264. a. Show the decryption equation. That is, show the equation for P as a function of C, K and K. b. Suppose an adversary has access to two sets of plaintexts and their corresponding ciphertexts and wishes to determine K. We have the two equations: C = ( PK) #Ki;C' = (P' K) EK First, derive an equation in one unknown (e.g., K.). Is it possible to proceed further to solve for K

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

2 . Consider a very simple symmetric block encryption algorithm, in which 6 4 - bits blocks of plaintext are encrypted using a 1 2 8 - bit key. Encryption is defined as C = ( P K 0 ) [ + ] K 1 where...

2 . Consider a very simple symmetric block encryption algorithm, in which 6 4 - bits blocks of plaintext are encrypted using a 1 2 8 - bit key. Encryption is defined as C = ( P K 0 ) K 1 where =...

2 . Consider a very simple symmetric block encryption algorithm, in which 6 4 - bits blocks of plaintext are encrypted using a 1 2 8 - bit key. Encryption is defined as where = ciphertext; = secret...

[ 3 0 points ] Consider a very simple symmetric block encryption algorithm, in which 3 2 - bits blocks of plaintext are encrypted using a 6 4 - bit key. Encryption is defined as C = ( P o + K l ) o x...

Consider a very simple symmetric block encryption algorithm, in which 32-bits blocks of plaintext are encrypted using a 64-bit key. Encryption is defined as C = P XAND (Kl XOR Kr) where C =...

(5 pts) Consider a symmetric block encryption algorithm in which 64-bit blocks of plaintext are encrypted using a 128-bit key. The encryption function is defined by: C (M xor Ko) K1 mod 264, where C...

1 . Consider a very simple symmetric block encryption algorithm in which 3 2 - bits blocks of plaintext are encrypted using a 6 4 - bit key. Encryption is defined as: C = ( P o + K 0 ) K 1 Where C...

Cyber Security Chapter 2, solve question 18 Question 17 2 pts Problem 2.3b - Consider the simple symmetric block encryption algorithm, in which 64 bit blocks of plain text text are encrypted using a...

1. Consider the following symmetric block encryption algorithm ALGO. ALGO operates on 16-bit blocks of plaintext using a 128- bit key. The plaintext is divided into two 8-bit blocks (LO, RO), and the...

2 . 4 Perhaps the simplest serious symmetric block encryption algorithm is the Tiny Encryption Algorithm ( TEA ) . TEA operates on 6 4 - bit blocks of plaintext using a 1 2 8 - bit key. The plaintext...

Describe the legislation and its major sections. [Summarize it - do not cut and paste.] List the parts that affect employers and summarize what they are required to do. List the parts that affect...

Dutcher, OConnor, and Gilchrist open an accounting practice on January 1, 2017 in Des Moines, Iowa to be operated as a partnership. To establish the business, Dutcher contributed a building with a...

( a ) Determine the amount you should invest to receive a quarterly return of RM 8 , 0 0 0 indefinitely, given the cost of capital is 4 . 5 percent per annum, compounded quarterly, for the following...

Which of the following would be considered a capital asset? a . A literary work held by the author b . Real estate held by a developer c . A taxpayer's principal residence d . A truck used in a...

Have roles been defined and assigned?

1. What will need to be included in the agenda for the first meeting?

Are conflict management processes implemented in the event of conflict among members?