Which publication describes Secure Portal VPNs and Secure Tunnel VPNs?

The publication that describes Secure Portal VPNs and Secure Tunnel VPNs is SP 800-113. This document focuses on guidelines for the selection and use of Virtual Private Network (VPN) technologies, emphasizing their importance in securing data transmission over untrusted networks.

SP 800-113 provides detailed information on various VPN types, including Secure Portal and Secure Tunnel VPNs, which are essential for organizations seeking to create secure connections for remote access or site-to-site networking. The framework it offers helps organizations understand how to implement and manage these VPN technologies effectively to maintain confidentiality, integrity, and availability of information in transit.

In contrast, the other publications listed have different focuses. For instance, SP 800-53 addresses security and privacy controls for federal information systems, SP 800-30 provides a risk management framework, and SP 800-171 consists of requirements for protecting controlled unclassified information in non-federal systems and organizations. These documents do not specifically cover the aspects of VPN technologies as outlined in SP 800-113.