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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

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

Database System Concepts
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
Problem 1PE
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q7- Please answer question in yellow highlight, All the other info in the attachment is for context 

Q7. Consider the diagram below and answer the following questions relating to block ciphers: Key Initialization Vector (IV) ▬▬▬▬▬▬▬▬▬ - block cipher encryption Plaintext ‒‒‒‒‒‒‒▬▬▬▬▬▬▬ Key →→→ CSE2SIA 2022 Sample Exam Plaintext block cipher encryption Ciphertext Ciphertext What block cipher mode of operation is shown? [ Block cipher mode of Operation Key → Plaintext block cipher encryption Block cipher is a method of encryption which uses a fixed length input and the output will be the same length cipher text. There are several mode of operations in a Block cipher mode. In the above figure it representing the Output Feedback Mode (OFB). In output feedback mode by using initialization vector and key an encrypted output is created and this is send to the next encryption block as feedback. And this encrypted output and plaintext are XORed together to get the original ciphertext in the current block. That is the original cipher in the current block is not sending to the next block. ▬▬▬▬▬▬▬▬▬ Ciphertext It helps to reduce bit transmission errors. And in OFB mode dependency between plain text and cipher text is very less. Here in the figure the Encryption operation using OFB mode is described. Which operation (encryption/decryption) is described in the diagram? mode Page 4 The changes needed in the diagram to make it Decryption operation using OFB The given figure is representing Encryption operation using OFB mode. The changes needed in the diagram to make it Decryption operation using OFB mode is in the figure the encrypted output and plain text is XORed instead of that in decryption the cipher text and encrypted output is XORed in the decryption 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
Transcribed Image Text:Q7. Consider the diagram below and answer the following questions relating to block ciphers: Key Initialization Vector (IV) ▬▬▬▬▬▬▬▬▬ - block cipher encryption Plaintext ‒‒‒‒‒‒‒▬▬▬▬▬▬▬ Key →→→ CSE2SIA 2022 Sample Exam Plaintext block cipher encryption Ciphertext Ciphertext What block cipher mode of operation is shown? [ Block cipher mode of Operation Key → Plaintext block cipher encryption Block cipher is a method of encryption which uses a fixed length input and the output will be the same length cipher text. There are several mode of operations in a Block cipher mode. In the above figure it representing the Output Feedback Mode (OFB). In output feedback mode by using initialization vector and key an encrypted output is created and this is send to the next encryption block as feedback. And this encrypted output and plaintext are XORed together to get the original ciphertext in the current block. That is the original cipher in the current block is not sending to the next block. ▬▬▬▬▬▬▬▬▬ Ciphertext It helps to reduce bit transmission errors. And in OFB mode dependency between plain text and cipher text is very less. Here in the figure the Encryption operation using OFB mode is described. Which operation (encryption/decryption) is described in the diagram? mode Page 4 The changes needed in the diagram to make it Decryption operation using OFB The given figure is representing Encryption operation using OFB mode. The changes needed in the diagram to make it Decryption operation using OFB mode is in the figure the encrypted output and plain text is XORed instead of that in decryption the cipher text and encrypted output is XORed in the decryption 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
Expert Solution
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1.

The encryption process utilizing the OFB mode is depicted in the following image. To convert the diagram into a Decryption operation utilizing the OFB mode, it must be changed such that the encrypted output and cipher text, rather than the plain text and encrypted output, are XORed.

The decryption diagram is given below:

Computer Science homework question answer, step 1, image 1

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