name: FALLBACK
full_form: Fallback to unprotected mode indicator
context: would be the case if the initiating IKE peer only uses the RSA signature authentication method and the responding IKE peer only accepts the PSK authentication method. Furthermore, if the PSK is kept as a fallback mechanism after the RSA signature authentication method is introduced, then fallback to PSK should only be allowed if the operator makes a policy change in the SEGs to allow PSK to be used. The operator may temporarily allow fallback to PSK if, for example, the SEGs are unable to verify the necessary certificates because of problems with the PKI. If PSK is kept as a fallback then it may be necessary to renew the PSK periodically for security reasons, or if PSK compromise is suspected.
description: Fallback refers to an operational mode where a network element or system reverts to a previous or less secure state due to compatibility issues or security concerns. In the context of IKE peer authentication, fallback to unprotected mode indicates a shift from a more secure authentication method (e.g., RSA signature) to a less secure one (e.g., PSK) as a temporary measure or for backward compatibility.
explanation: The classification of 'Fallback' as a Mode is justified by the context describing its role in temporarily switching between different authentication methods due to compatibility issues or security concerns, highlighting its operational nature within network systems.
section_title: 8	Backward compatibility for NDS/IP NE's and SEGs
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