A block cipher has block length 3. When the key is k, the results of encrypting block with this cipher are given in the table below: m 000 001 010 011 m E(m, k) 101 110 010 100 E(m, k) 011 100 111 101 001 110 000 111 (i) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in CBC mode, with key k and IV 111. (ii) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in ECB mode, with key k. (iii) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in CTR mode, with key k and initial counter value 100.

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A block cipher has block length 3. When the key is k, the results of encrypting a
block with this cipher are given in the table below:
m E(m, k)
m E(m, k)
000
011
100
101
001
111
101
110
010
001 110
010
011
000 111
100
(i) Decrypt the ciphertext 010011011 given that it was created by using this
block cipher in CBC mode, with key k and IV 111.
(ii) Decrypt the ciphertext 010011011 given that it was created by using this
block cipher in ECB mode, with key k.
(iii) Decrypt the ciphertext 010011011 given that it was created by using this
block cipher in CTR mode, with key k and initial counter value 100.
Transcribed Image Text:A block cipher has block length 3. When the key is k, the results of encrypting a block with this cipher are given in the table below: m E(m, k) m E(m, k) 000 011 100 101 001 111 101 110 010 001 110 010 011 000 111 100 (i) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in CBC mode, with key k and IV 111. (ii) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in ECB mode, with key k. (iii) Decrypt the ciphertext 010011011 given that it was created by using this block cipher in CTR mode, with key k and initial counter value 100.
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