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Question 4 Keys Suppose Alice wants to send a message to Bob. Bob has a public - private key pair and can provide a digital

Question 4Keys
Suppose Alice wants to send a message to Bob. Bob has a public-private key pair and can provide a digital certificate as well. But Alice does not have a public-private key pair. Without using symmetric keys, is it possible to design a scheme such that Alice can send the message to Bob achieving both confidentiality and integrity?
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