Suppove you are a spy, and you need to pass secret matemals to another spy, Agent smar Howeter, you and Smart have never before met. You are aware that bo tile fones are all around, any one of whom might try to impersonate smart if you approach someone and asked if she is Agent Smart, she might say she is even if she is not, Sugeest a control for this threat that is, a way you could be convinced the persou to whom sou are talking is toally Agort Smart. Would your technique work you assumed your telephone and mail were being monte tored by the hostile agents? Suggest a way that would work even if your communications were monitored.

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