Question: Consider a new cipher block chaining (NCBC) scheme where mn+1 cn mn is encrypted to yield Cn+1 (recall that in the regular CBC, mn+1

Consider a new cipher block chaining (NCBC) scheme where mn+1 cn mn is encrypted to yield Cn+1 (recall that

Consider a new cipher block chaining (NCBC) scheme where mn+1 cn mn is encrypted to yield Cn+1 (recall that in the regular CBC, mn+1 cn is encrypted to yield Cn+1). (a) With regular CBC, if one ciphertext block is lost, how many plaintext blocks are lost? (b) With NCBC, why do things get back in sync if cn and C+1 are switched? (c) How about if a ciphertext block is lost? (d) How about if ciphertext block n is switched with ciphertext block n+2? (e) How about any permutation of the first n blocks?

Step by Step Solution

★★★★★

3.38 Rating (151 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a With regular CBC if one ciphertext block is lost only the corresponding plaintext block is lost In ... View full answer

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 Computer Network Questions!

Slave Lake Shoe Source purchases ladies shoes for $35 each pair and has a markup of 60% on selling price. What is the rate of markdown on these shoes if it sells them at the cost price during a New...

The following additional information is available for the Dr. Ivan and Irene Incisor family from Chapters 1-5. Ivan's grandfather died and left a portfolio of municipal bonds. In 2012, they pay Ivan...

Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...

List 4 techniques to manage cash flows List three types of financial statements. What is the standard rate of GST in Australia

PLEASE WRITE IN C Vigenere with Cipher Block Chaining This assignment involves implementing the Vigenere cipher as a block cipher and using the Cipher Block Chaining mode of operation, which we have...

Vigenere with Cipher Block Chaining This assignment involves implementing the Vigenere cipher as a block cipher and using the Cipher Block Chaining mode of operation, which we have studied in lecture...

FIles from tar gz: 1) func_desc.txt: Built in functions information: We will give a brief description of the merely built in functions you are allowed to use. You can find information on most of the...

5. Consider a block cipher where the block size is one byte and the encryption (and decryption) algorithm is XORing the plaintext block with a one-byte key. Given a plaintext P and a key K with the...

Given a plaintext block P and a round key K 0 with the following values: P= 000102030405060708090A0B0C0D0E0F K 0 = 00102030405060708090A0B0C0D0E0F0 would the internal state be after the initial AES...

About CCA-Security Until now we have defined security against two types of attacks: passive eavesdropping and chosen-plaintext attacks. A chosen-ciphertert attack is even more powerful. In a...

The magnetic moment of the Earth is approximately 8.00 x 1022 A (m2. (a) If this were caused by the complete magnetization of a huge iron deposit, how many unpaired electrons would this correspond...

1. Myth or Facts of Organizational Viewpoints Respond to ONE of the following statements: Men are stronger leaders than women during organizational crises. Women are more nurturing managers than...

Which of the following is NOT one of the skx strategic business objectives? A . Competifive advantage B . Survival C . Operational excellence D . Improved decision making E . Artificial intelligence

Let R be a square matrix. Consider the following two statements: A) if R2 = I then R = I or R= -I %3D B) if R2 = I then det(R) = 1 or det(R): = -1 Which of them is true (for all possible R RI'...

A new client of yours, Ray Marquez, wants to open a kiosk at the local mall selling smoothies, specifically fruit smoothies, protein smoothies, green smoothies (kale, vegetables, etc.), muscle...

Suppose the production possibility boundary (PPB) for a country that produces only two goods (x and y) is given by y = 100 x 2 . Therefore the slope of the PPB at any given level of good x...

1 A US firm has sold $100 million in exports to another firm in the UK. The current spot rate is $2.00 = 1 so the UK firm has contractually agreed to pay the US firm 50 million in 30 days. Thus the...

A particle in the harmonic oscillator potential starts out in the state ( x, 0 ) = A [ 3 0 ( x ) + 4 1 ( x ) ] a. Find A b. Construct ( x, t ) and l ( x, t ) l 2

Question 8(1 point)Which non-litigious approach is becoming an effective method of obtaining compliance with CEPA? Binding arbitration Compulsory mediation Negotiations to solutions that bring...

Suppose you have a block cipher Ek(x) that has 256 bits of security. Now consider a new cipher which is the original cipher composed with itself using independent keys. Ek1,k2(x)=Ek1Ek2(x) How many...

Start with 256-bit AES. Mr Paranoid, who wants a super secure block cipher, considers embedding this version of AES in a Fiestel structure as shown on the right. Assume he instantiates the...

Why is Counter Block Mode (CTR) important? The encryption and decryption of error messages are used. Multiple blocks can be generated for encryption and decryption Data padding is available to be...

encryptFile. java import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Scanner; import javax.crypto.Cipher; import...

encryptFile.java import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Scanner; import javax.crypto.Cipher; import...

Consider a Feistel cipher with r rounds and n = 128 (half the block length); = 256 (the key bit size). Then M {0, 126 (the plaintext space), C = {0, 13256 (the ciphertext space), and K= {0, 13256...