AC — ACCESS CONTROL

AC-21: INFORMATION SHARING

NIST 800-53R4 Membership AC-21:
MODERATE
HIGH

The organization:

a. Facilitates information sharing by enabling authorized users to determine whether access authorizations assigned to the sharing partner match the access restrictions on the information for [Assignment: organization-defined information sharing circumstances where user discretion is required]; and
b. Employs [Assignment: organization-defined automated mechanisms or manual processes] to assist users in making information sharing/collaboration decisions.

SUPPLEMENTAL GUIDANCE

This control applies to information that may be restricted in some manner (e.g., privileged medical information, contract-sensitive information, proprietary information, personally identifiable information, classified information related to special access programs or compartments) based on some formal or administrative determination. Depending on the particular information-sharing circumstances, sharing partners may be defined at the individual, group, or organizational level. Information may be defined by content, type, security category, or special access program/compartment.

AC-3 — ACCESS CONTROL | ACCESS ENFORCEMENT

CONTROL ENHANCEMENTS

AC-21 (1) INFORMATION SHARING | AUTOMATED DECISION SUPPORT

The information system enforces information-sharing decisions by authorized users based on access authorizations of sharing partners and access restrictions on information to be shared.

Supplemental Guidance: NONE

AC-21 (2) INFORMATION SHARING | INFORMATION SEARCH AND RETRIEVAL

The information system implements information search and retrieval services that enforce [Assignment: organization-defined information sharing restrictions].