Answer:

For two parties A and B, there are the following options:

· A key could be selected by A and physically delivered to B.

· A third party could select the key and physically deliver it to A and B.

· If A and B have previously and recently used a key, one party could transmit the new key to the other, using the old key to encrypt the new key.

If A and B each have an encrypted connection to a third party C, C could deliver a key on the encrypted links to A and B.

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Answer:

Ans: For two parties A and B, key distribution can be achieved in a number of ways, as follows: 1. A can select a key and physically deliver it to B. 2. A third party can select the key and physically deliver it to A and B. 3.