Exercise 3. Modes of Operation [40 points] Part 1. In class we discussed the CBC mode...
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Exercise 3. Modes of Operation [40 points] Part 1. In class we discussed the CBC mode of operation where in order to encrypt a message an initialization vector (IV) is first selected. Let S be a server that encrypts all transmitted messages using the CBC mode of encryption. Instead of selecting a fresh IV every single time, S always sets IV; IV-1 + 1 when encrypting the ith message. Explain why this scheme is not CPA secure, i.e. how an attacker can break the CPA game with probability 1/2 + p(n) where p(n) is a non-negligible value. = Part 2. Show that the OFB mode of encryption is not CCA secure, i.e. how an attacker can break the CCA game with probability 1/2 + p(n) where p(n) is a non- negligible value. Exercise 3. Modes of Operation [40 points] Part 1. In class we discussed the CBC mode of operation where in order to encrypt a message an initialization vector (IV) is first selected. Let S be a server that encrypts all transmitted messages using the CBC mode of encryption. Instead of selecting a fresh IV every single time, S always sets IV; IV-1 + 1 when encrypting the ith message. Explain why this scheme is not CPA secure, i.e. how an attacker can break the CPA game with probability 1/2 + p(n) where p(n) is a non-negligible value. = Part 2. Show that the OFB mode of encryption is not CCA secure, i.e. how an attacker can break the CCA game with probability 1/2 + p(n) where p(n) is a non- negligible value.
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Part 1 CBC Mode not CPA Secure In the CBC Cipher Block Chaining mode of operation each block of plaintext is XORed with the previous ciphertext block ... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
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