Encryption Key Auto Exchange Settings - Ricoh Pro C9100 Operating Instructions Manual

5. Enhanced Network Security
function supports 2 security protocols: the ESP protocol, which enables both of the IPsec functions at the
same time, and the AH protocol, which enables only the authentication function.
ESP protocol
The ESP protocol provides secure transmission through both encryption and authentication. This
protocol does not provide header authentication.
• For successful encryption, both the sender and receiver must specify the same encryption
algorithm and encryption key. If you use the encryption key auto exchange method, the
encryption algorithm and encryption key are specified automatically.
• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. If you use the encryption key auto exchange method, the
authentication algorithm and authentication key are specified automatically.
AH protocol
The AH protocol provides secure transmission through authentication of packets only, including
headers.
• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. If you use the encryption key auto exchange method, the
authentication algorithm and authentication key are specified automatically.
AH protocol + ESP protocol
When combined, the ESP and AH protocols provide secure transmission through both encryption
and authentication. These protocols provide header authentication.
• For successful encryption, both the sender and receiver must specify the same encryption
algorithm and encryption key. If you use the encryption key auto exchange method, the
encryption algorithm and encryption key are specified automatically.
• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. If you use the encryption key auto exchange method, the
authentication algorithm and authentication key are specified automatically.
• Some operating systems use the term "Compliance" in place of "Authentication".

Encryption Key Auto Exchange Settings

For key configuration, this machine supports automatic key exchange to specify agreements such as the
IPsec algorithm and key for both sender and receiver. Such agreements form what is known as an SA
(Security Association). IPsec communication is possible only if the receiver's and sender's SA settings are
identical.
If you use the auto exchange method to specify the encryption key, the SA settings are auto configured
on both parties' machines. However, before setting the IPsec SA, the ISAKMP SA (Phase 1) settings are
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