FedRAMP High Baseline TLS Configuration Requirements

Meeting the FedRAMP High Baseline TLS configuration requirements is not optional—it is mandatory for systems handling the most sensitive government data. These requirements are strict. They define exactly which ciphers, protocols, and key lengths are acceptable. Deviate, and you fail certification.

Protocols

The FedRAMP High Baseline enforces the use of TLS 1.2 or higher. TLS 1.3 is preferred for its improved security and reduced handshake overhead. All earlier versions—TLS 1.0, 1.1—must be disabled at the server level.

Cipher Suites

Weak algorithms are forbidden. RC4, 3DES, and any cipher with less than 128-bit key strength cannot be used. FedRAMP aligns with NIST guidelines, recommending AES-GCM with 256-bit keys, paired with elliptic curve Diffie-Hellman (ECDHE) for forward secrecy. For TLS 1.2, suites like TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 meet the baseline. For TLS 1.3, the allowed set is smaller but stronger, with defaults like TLS_AES_256_GCM_SHA384.

Key Management

The High Baseline requires RSA keys at least 2048 bits or ECDSA using P-256 or stronger curves. Keys must be rotated regularly and stored in FIPS 140-2 validated modules. Self-signed certificates are not acceptable in production—only CA-issued certificates that meet the trust chain requirements.

Configuration Hardening

Disable renegotiation. Enforce strict cipher ordering so the server decides the suite. Enable certificate revocation checks via OCSP stapling. Apply HSTS with a long max-age to ensure browsers only connect over HTTPS. Test your configuration using tools like openssl s_client and automated scanners against FedRAMP compliance scoring.

Verification

Document every TLS parameter: supported protocol versions, cipher suite list, certificate details, and key storage location. Auditors will demand evidence. Continuous monitoring ensures no drift from the approved FedRAMP High Baseline TLS configuration.

A fully compliant TLS configuration is not just security—it is a contractual requirement for systems under FedRAMP High. Get it wrong and you risk losing your Authority to Operate. Get it right and your system earns trust.

Run a FedRAMP High Baseline TLS configuration instantly at hoop.dev—see it live in minutes.