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Data security and encryption
How data is kept unreadable to anyone who should not see it: encryption, certificates, TLS and hashing.
8 lessons
- What is encryption? Encryption uses a key to turn readable data into a scramble and back again. What it protects, where it stops, and what to check in your business. Beginner 3 min read
- Encryption at rest vs encryption in transit Data can be encrypted where it is stored and while it travels. What each one protects against, where each stops, and why you need both. Intermediate 3 min read
- What is end-to-end encryption? End-to-end encryption means only the people at each end can read a message. What that changes, what it leaves visible, and what to ask a provider. Beginner 3 min read
- What is public key encryption? Public key encryption uses two linked keys: one you share and one you keep. How the pair works, and where your business already relies on it. Intermediate 3 min read
- What is a digital certificate? A digital certificate ties a public key to a name, and a trusted authority signs it. What is inside one, who vouches for it, and why it expires. Intermediate 3 min read
- What is TLS? TLS is the protocol that secures a connection between two computers. What it promises, how the handshake works, and which versions to allow. Intermediate 3 min read
- What is hashing? Hashing turns any data into a short fingerprint that cannot be turned back. How it works, and why passwords should be stored this way. Beginner 3 min read
- Encryption vs hashing: what’s the difference? Encryption can be reversed with a key. Hashing cannot be reversed at all. What each is for, and which one should protect what. Intermediate 3 min read
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