NIST 800-172
3.5 IDENTIFICATION AND AUTHENTICATION
3.5.1e
Identify and authenticate [Assignment: organization-defined systems and system components] before establishing a network connection using bidirectional authentication that is cryptographically based and replay resistant.
Identify system users processes acting on behalf of users and devices.Cryptographically-based and replay-resistant authentication between systems components and devices addresses the risk of unauthorized access from spoofing (i.e. claiming a false identity). The requirement applies to client-server authentication server-server authentication and device authentication (including mobile devices). The cryptographic key for authentication transactions is stored in suitably secure storage available to the authenticator application (e.g. keychain storage Trusted Platform Module [TPM] Trusted Execution Environment [TEE] or secure element). Mandating authentication requirements at every connection point may not be practical and therefore such requirements may only be applied periodically or at the initial point of network connection
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