Impersonation is closely related to unauthorized access but is significant enough to be discussed separately. Impersonation is the ability to present credentials as if you are something or someone you are not. These attacks can take several forms: stealing a private key or recording an authorization sequence to replay at a later time. These attacks are commonly referred to as man-in-the-middle attacks, where an intruder is able to intercept traffic and can as a result hijack an existing session, alter the transmitted data, or inject bogus traffic into the network. In large corporate networks, impersonation can be devas- tating because it.
