The data exchanged between hosts participating in mobile IP may also be
encrypted. Any of the standard approaches may be used (see Chapter 5), giving
rise to three models. In the first, the source of the data encrypts it and sends it
through the home agent to the mobile node, which decrypts it. In the second model,
the home agent chooses whether to encrypt the data it forwards according to
whether the mobile node is away from or at home--in this way data forwarded
to a roving mobile node is encrypted across the unknown part of the network
and is decrypted ...
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