Encryption at Rest & in Transit

Encryption comes in two flavors that cover the two states your data is ever in. In transit means encrypting data as it moves across networks, which is what TLS does for web traffic, so anyone intercepting the connection sees scrambled bytes. At rest means encrypting data where it's stored, on disks and in backups, so a stolen drive or a breached storage bucket yields nothing readable.

Both are increasingly table stakes rather than premium features. Most cloud providers encrypt storage volumes at rest by default now, and TLS certificates for encryption in transit are free and automatic. The two together mean data is protected whether it's sitting still or flying across the internet, which closes the obvious gaps an attacker would target.

The part that still takes thought is key management and the layers encryption doesn't cover. Encryption at rest protects against physical theft, not against an attacker who's already inside your running system with valid access. It's a necessary layer, and it works alongside firewalls, IAM, and secrets management rather than replacing any of them.