Q7. Consider the diagram below and answer the following questions relating to block ciphers: Key Initialization Vector (IV) Plaintext block cipher encryption Key Plaintext block cipher encryption Ciphertext Key Plaintext block cipher encryption Ciphertext What block cipher mode of operation is shown? Which operation (encryption/decryption) is described in the diagram? Describe the change required in the diagram to perform the reverse operation (encryption decryption) Ciphertext

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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Q7. Consider the diagram below and answer the following questions relating to block ciphers:
Initialization Vector (IV)
Key →
Plaintext
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
block cipher
encryption
A
‒‒‒‒‒‒‒
Key
block cipher
encryption
Plaintext
‒‒‒‒‒‒‒‒‒‒‒‒‒
Key →
Ciphertext
Plaintext
block cipher
encryption
☺
‒‒‒‒‒‒‒
Ciphertext
What block cipher mode of operation is shown?
Which operation (encryption/decryption) is described in the diagram?
Describe the change required in the diagram to perform the reverse operation (encryption
decryption)
Using this block cipher mode, which of the operations is faster (if any)?
Briefly explain why this is so
Ciphertext
Transcribed Image Text:Q7. Consider the diagram below and answer the following questions relating to block ciphers: Initialization Vector (IV) Key → Plaintext ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ block cipher encryption A ‒‒‒‒‒‒‒ Key block cipher encryption Plaintext ‒‒‒‒‒‒‒‒‒‒‒‒‒ Key → Ciphertext Plaintext block cipher encryption ☺ ‒‒‒‒‒‒‒ Ciphertext What block cipher mode of operation is shown? Which operation (encryption/decryption) is described in the diagram? Describe the change required in the diagram to perform the reverse operation (encryption decryption) Using this block cipher mode, which of the operations is faster (if any)? Briefly explain why this is so Ciphertext
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