Encryption in Transit Standards
Standards for protecting data during transmission using TLS 1.3, mTLS, and network-layer encryption to prevent eavesdropping and man-in-the-middle attacks.
Standards for protecting data during transmission using TLS 1.3, mTLS, and network-layer encryption to prevent eavesdropping and man-in-the-middle attacks.
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Encryption in transit (also called encryption in motion) protects data as it moves between systems, networks, and endpoints by establishing encrypted communication channels that prevent eavesdropping, tampering, and man-in-the-middle attacks. The primary protocols are TLS 1.3 for application-layer encryption and IPsec or WireGuard for network-layer encryption.
TLS 1.3, the current standard, establishes encrypted sessions through a streamlined handshake that completes in a single round trip. The client and server negotiate cipher suites (TLS 1.3 mandates forward-secret key exchange using ECDHE), authenticate the server via X.509 certificates, and derive session keys. All subsequent data is encrypted with AEAD ciphers (AES-256-GCM or ChaCha20-Poly1305). Mutual TLS (mTLS) adds client certificate authentication, commonly used for service-to-service communication in microservice architectures. For network-layer protection, IPsec tunnels encrypt all IP traffic between endpoints, while WireGuard provides a modern, performant alternative with a minimal attack surface. Best practices include disabling TLS 1.0 and 1.1, enforcing HSTS headers, implementing certificate transparency monitoring, and encrypting internal east-west traffic -- not just north-south perimeter traffic.
PCI DSS Requirement 4 mandates encryption of cardholder data during transmission over open networks. HIPAA requires encryption of ePHI in transit. NIST SP 800-52 provides detailed TLS implementation guidance for federal systems. Without transit encryption, network-level attackers -- including compromised WiFi, BGP hijacking, and rogue network devices -- can intercept sensitive data in plaintext. The shift to zero-trust architectures makes universal transit encryption mandatory, as internal networks are no longer considered trusted.
CDA addresses encryption in transit within the Data Protection and Sovereignty domain as a C-BUILD baseline requirement. Our missions audit current TLS configurations, remediate weak cipher suites, implement mTLS for service meshes, and establish certificate lifecycle management processes.
CDA Theater missions that address topics covered in this article.
Evidence collection and chain of custody ensure digital evidence maintains integrity and legal admissibility through forensically sound gathering techniques, cryptographic verification, and documented handling records.
Incident response plan development creates a structured, documented approach for handling cybersecurity incidents, defining roles, procedures, and communication protocols to enable rapid, coordinated response.
Written by CDA Editorial
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