Consider the following encryption scheme: To encrypt a message of size 2n bits, first break it...
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Consider the following encryption scheme: To encrypt a message of size 2n bits, first break it into two pieces m₁m2 each of n bits. Next, choose a random number r uniformly at random, of size l≤n bits. Then, output the cipher-text: r||Fk(r) – m₁||Fk (r + 1) © m₂ where F is a PRF. What can go right or wrong with this scheme in terms of CPA security? Specifically, what happens if is small compared to the key-size n? What happens if = n? Comment on how the choice of affects the security of this system and why. Consider the following encryption scheme: To encrypt a message of size 2n bits, first break it into two pieces m₁m2 each of n bits. Next, choose a random number r uniformly at random, of size l≤n bits. Then, output the cipher-text: r||Fk(r) – m₁||Fk (r + 1) © m₂ where F is a PRF. What can go right or wrong with this scheme in terms of CPA security? Specifically, what happens if is small compared to the key-size n? What happens if = n? Comment on how the choice of affects the security of this system and why.
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Data Structures and Algorithms in Java
ISBN: 978-1118771334
6th edition
Authors: Michael T. Goodrich, Roberto Tamassia, Michael H. Goldwasser
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