Question1. (4 pts) Consider a block cipher that operates on a block size of 9 bits, producing a ciphertext that is also 9 bits long. For any block cipher like this, how many different ciphertexts are possible in all? 2.How many different 9-bit block ciphers can there be in all?Question 2. (3 pts) Even if a block cipher has sufficient diffusion properties to obscure the plaintext, if it has poor confusion, an adversary may still be able to recover the key. What type of analysis, using what data, would allow the adversary to reconstruct a key in this case?

The art and science of secure communication and data protection in the presence of enemies is known…

Answered: Question1. (4 pts) Consider a block…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Question1. (4 pts) Consider a block cipher that operates on a block size of 9 bits, producing a ciphertext that is also 9 bits long.

- For any block cipher like this, how many different ciphertexts are possible in all?
  2.How many different 9-bit block ciphers can there be in all?

Question 2. (3 pts) Even if a block cipher has sufficient diffusion properties to obscure the plaintext, if it has poor confusion, an adversary may still be able to recover the key. What type of analysis, using what data, would allow the adversary to reconstruct a key in this case?

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