Stream ciphers are malleable] Suppose that the message "Pay $1.00 to Bob" is encrypted using a stream cipher as "4d6c73d5240a948f86951bc29481a542" (in hex). You know that the plaintext etters are encoded as 8-bit ASCII characters. Provide a modified ciphertext such that the decryption would read "Pay $1000 to Bob". Hint: You need to work out the attack explained in Lecture 2-2, Slide 11. Also, note that you do not need to know the keystream to implement your attack although in principle, you are able to compute it).
Stream ciphers are malleable] Suppose that the message "Pay $1.00 to Bob" is encrypted using a stream cipher as "4d6c73d5240a948f86951bc29481a542" (in hex). You know that the plaintext etters are encoded as 8-bit ASCII characters. Provide a modified ciphertext such that the decryption would read "Pay $1000 to Bob". Hint: You need to work out the attack explained in Lecture 2-2, Slide 11. Also, note that you do not need to know the keystream to implement your attack although in principle, you are able to compute it).
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Computer science
![[Stream ciphers are malleable] Suppose that the message "Pay $1.00 to Bob" is encrypted using
a stream cipher as "4d6c73d5240a948f86951bc29481a542" (in hex). You know that the plaintext
letters are encoded as 8-bit ASCII characters. Provide a modified ciphertext such that the decryption
would read "Pay $1000 to Bob".
Hint: You need to work out the attack explained in Lecture 2-2, Slide 11.
Also, note that you do not need to know the keystream to implement your attack
(although in principle, you are able to compute it).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fab97fc5d-56e7-4eff-8b17-ffcd1c2f26a4%2F5f961088-fb3f-4b1b-a7ad-43d028f73272%2F8xvyyhs_processed.jpeg&w=3840&q=75)
Transcribed Image Text:[Stream ciphers are malleable] Suppose that the message "Pay $1.00 to Bob" is encrypted using
a stream cipher as "4d6c73d5240a948f86951bc29481a542" (in hex). You know that the plaintext
letters are encoded as 8-bit ASCII characters. Provide a modified ciphertext such that the decryption
would read "Pay $1000 to Bob".
Hint: You need to work out the attack explained in Lecture 2-2, Slide 11.
Also, note that you do not need to know the keystream to implement your attack
(although in principle, you are able to compute it).
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