Which of the following is a required concept of single packet
authorizations (SPAs)?
Single Packet Authorization (SPA) is a security protocol that allows a user to access a secure network without the need to enter a password or other credentials.Instead, it is an authentication protocol that uses a single packet -- an encrypted packet of data -- to convey a user's identity and request access1. A key concept of SPA is that the SPA packet must be digitally signed and authenticated by the SPA server before granting access to the user.This ensures that only authorized users can send valid SPA packets and prevents replay attacks, spoofing attacks, or brute-force attacks23.
Reference=
Zero Trust: Single Packet Authorization | Passive authorization
Single Packet Authorization | Linux Journal
Single Packet Authorization Explained | Appgate Whitepaper
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