Encrypted with a symmetric key, Computer Networking

Alice sends a message to Bob, encrypted with a symmetric key. Bob decrypts the message and finds it is a purchase order for an expensive workstation. When the time comes to deliver the workstation, Alice denies ever placing the order. Is it possible for Bob to prove to a third party that Alice sent the order? Why or why not?

Posted Date: 3/13/2013 2:59:56 AM | Location : United States

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