name: PSK
full_form: Pre-Shared Key
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: A Pre-Shared Key (PSK) is a secret key shared between two parties used for authentication in Internet Key Exchange (IKE) protocol. It serves as an alternative to the RSA signature authentication method and may be used as a fallback mechanism under specific conditions.
explanation: The context explicitly mentions PSK being used for authentication, stored as a fallback mechanism, and potentially needing renewal due to security concerns. This usage aligns with the definition of a Parameter in telecommunications, specifically an attribute critical for network operation.
section_title: 8	Backward compatibility for NDS/IP NE's and SEGs
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