Question: Imagine that you are developing a messenger app (like WhatApp). It lets users make calls over the Internet. Your requirements are: (i) encrypt data communication

Imagine that you are developing a messenger app (like WhatApp). It lets users make calls over the Internet. Your requirements are: (i) encrypt data communication for each call. (ii) use a unique encryption key for each couple of users but (iii) prevent this key from getting shared over the Internet. (a) How can you achieve this? [2] (b) Briefly outline the algorithm. [3]

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