Understanding Encryption
Encryption is the foundational technology for protecting data confidentiality. It ensures that even if data is intercepted during transmission or accessed through a breach, it remains unreadable without the proper decryption key. Modern encryption algorithms are mathematically proven to be infeasible to break without the key, making encryption one of the most reliable security controls available.
Organizations must encrypt data in two states: at rest (stored on disk, in databases, or in backups) and in transit (moving across networks). Every major compliance framework including SOC 2, HIPAA, PCI-DSS, and ISO 27001 requires encryption of sensitive data in both states. HIPAA specifically provides a safe harbor for encrypted data, meaning a breach of properly encrypted PHI may not trigger notification requirements.
Key management is often more challenging than encryption itself. The security of encrypted data depends entirely on protecting the encryption keys. Poor key management can render even the strongest encryption useless.
Encryption Types
Symmetric encryption (AES)
Same key for encryption and decryption. Fast and efficient. AES-256 is the standard for data at rest.
Asymmetric encryption (RSA, ECC)
Different keys for encryption and decryption (public/private key pair). Used for key exchange and digital signatures.
Transport encryption (TLS)
Protects data in transit between systems. TLS 1.2 or higher is required. TLS 1.3 is recommended.
Full-disk encryption
Encrypts entire storage volumes. Protects against physical theft of devices. Built into modern operating systems.
Database encryption
Protects data stored in databases. Can be implemented at the column, table, or entire database level.