TLS and HTTPS

Last reviewed May 28, 2026 Content v20260528

Track mode

none

Means

Read / quiz

Reading

~1 min

Level

beginner

This lesson

This lesson teaches TLS and HTTPS: 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 TLS and HTTPS 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.

TLS encrypts traffic between browser and server—provides confidentiality and integrity on the wire. Users expect HTTPS everywhere.

Handshake intuition

Client and server agree keys; certificate proves server identity (PKI). Padlock icon means TLS active—not that site is trustworthy.

Use Let's Encrypt or cloud-managed certs; automate renewal; disable old TLS versions (1.0/1.1).

HTTPS pages must not load active HTTP scripts—browsers block or weaken security.

Tip: Set HSTS max-age only after HTTPS works everywhere.

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