Question: 2. (10 points) It is possible to use a hash function to construct a block cipher with a structure similar to DES. Because a hash

2. (10 points) It is possible to use a hash function

2. (10 points) It is possible to use a hash function to construct a block cipher with a structure similar to DES. Because a hash function is one-way and a block cipher must be reversible (to decrypt), how is it possible

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