Encryption at Rest and in Transit

Last reviewed May 28, 2026 Content v20260528

Track mode

none

Means

Read / quiz

Reading

~1 min

Level

intermediate

This lesson

This lesson teaches Encryption at Rest and in Transit: security mindset, common threats, and defensive practices for software teams.

Data in transit and at rest failures appear in compliance audits and breach reports alike.

You will apply Encryption at Rest and in Transit in contexts like: Web apps, APIs, CI/CD, and organizational compliance programs.

Read scenario-based lessons, map controls to code you write on other tracks, and complete MCQs—practice threat modeling on paper or in docs.

When you can explain the previous lesson's ideas in your own words.

Data needs protection in transit (TLS) and at rest (disk/database encryption)—keys managed separately from ciphertext.

At rest

Database TDE, encrypted EBS/RDS, S3 SSE—protects stolen drives/backups; does not replace access control.

Use KMS/HSM; rotate keys; never commit keys to git—see secrets lesson.

Hashing is one-way (passwords); encryption is reversible with the key (data storage).

Q: Encryption at rest stops DB admin?
A: No—authorized DB users still read data; encryption helps physical theft scenarios.
Q: KMS?
A: Cloud key management service with audit and rotation.

Tip: Encryption at rest does not replace RBAC on the database.

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