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xplain in a few sentences the difference between computationally secure schemes and perfectly secure ones. Give one example of a cryptosystem for each of these

xplain in a few sentences the difference between computationally secure schemes and

perfectly secure ones. Give one example of a cryptosystem for each of these categories.

Why is the CBC mode of encryption insecure?

Describe the Counter Model of Operation of a block cipher.

Describe 3DES. Is a 2DES secure? Why?

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