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Modes of Operations - Cryptography a) OFB can address some of the limitations of CBC. Please...

Modes of Operations - Cryptography

a) OFB can address some of the limitations of CBC. Please explain in your words, how does OFB eliminate some of the problems of CBC. Please be specific and provide references in how OFB works    

b) What are the advantages of CTR mode over OFB? Explain how CTR achieves these advantages in its design.            

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