This exercise is fromIntroduction to Modern Cryptography (2nd Edition) by Katz& Lindell
In this question we assume a three-round SPN with 64-bit block length. Assume independent 64-bit sub-keys are used in each round, so the master key is 256 bits long. Show a key-recovery attack using approximately 2 128 – 2128 time. Show transcribed image text
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