Understanding Encryption
Encryption transforms readable data into an unintelligible format that can only be reversed (decrypted) with the correct cryptographic key. Two primary types exist: symmetric encryption (AES-256), which uses the same key for encryption and decryption and is used for bulk data, and asymmetric encryption (RSA, ECC), which uses a key pair (public and private) and is used for key exchange, digital signatures, and secure communication establishment.
Encryption protects data in two states: at rest (stored on disks, databases, and backups) and in transit (moving across networks). AES-256 is the standard for data at rest, while TLS 1.2 or higher protects data in transit. Full-disk encryption protects laptops and storage devices if physically stolen. Database-level and field-level encryption add additional layers for sensitive data like ePHI or cardholder data.
Encryption and Key Management
The security of encrypted data ultimately depends on proper key management. Encryption keys must be generated securely, stored separately from the encrypted data, rotated regularly, and revoked when no longer needed. Common key management failures include storing keys alongside encrypted data, using weak or predictable keys, failing to rotate keys after personnel changes, and not maintaining key inventory and lifecycle management.
Encryption Compliance Requirements
For San Diego businesses, encryption is a requirement across virtually every compliance framework. HIPAA requires encryption of ePHI at rest and in transit (addressable safeguard, but practically mandatory). PCI-DSS mandates encryption of cardholder data. CMMC requires encryption of CUI. SOC 2 expects encryption as a standard security control. California’s CCPA/CPRA provides a safe harbor from breach notification requirements when data is properly encrypted.