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2. After your explanation in part 1), Barney agrees to use SHA-2 for hashing. However, to save space he proposes to only use the first 128 bits to create a 128 bit hash. He argues that since 128 bit encryption keys are secure, a 128 bit hash should also be secure. Explain what kind of attack a 128 bit hash would be vulnerable to, and why.

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2. After your explanation in part 1), Barney agrees to use SHA-2 for hashing. However, to save space...

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