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12 of 58 lessons about Security, intermediate level Show all lessons

Cyber security fundamentals

How attacks work, in plain words: ransomware, phishing, malware and the flaws they use.

3 of 8 lessons shown

  1. How ransomware attacks work The three stages of a ransomware attack, how attackers get in, why they go after backups, and what to put in place before it happens. Intermediate 3 min read
  2. What is a zero-day vulnerability? A zero-day is a software weakness that attackers can use before a fix exists. What that means for a business, and what protects you meanwhile. Intermediate 3 min read
  3. What is a CVE? A CVE is the public reference number for one security vulnerability. Who assigns them, how to read one, and what a severity score adds. Intermediate 3 min read

Identity, passwords and access

Proving who is signing in: multi-factor authentication, passkeys, password managers and single sign-on.

2 of 6 lessons shown

  1. How multi-factor authentication works What happens behind a text code, an authenticator app, an approval prompt and a passkey, and why only some of them stop a fake sign-in page. Intermediate 3 min read
  2. Passwords vs passkeys: what’s the difference? A password is a secret you share with a website. A passkey shares nothing. How the two compare, and how a business moves from one to the other. Intermediate 3 min read

Data security and encryption

How data is kept unreadable to anyone who should not see it: encryption, certificates, TLS and hashing.

5 of 8 lessons shown

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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

Websites, hosting and domains

What happens between typing an address and seeing a page: domains, DNS, hosting, HTTPS and CDNs.

1 of 9 lessons shown

  1. HTTP vs HTTPS: what’s the difference? HTTP sends web pages in the open and HTTPS sends them encrypted. What visitors see in the browser, and what moving a site to HTTPS involves. Intermediate 3 min read

Networks and business IT

The equipment in the comms cupboard and what it does: addresses, routers, firewalls, VLANs and VPNs.

1 of 6 lessons shown

  1. What is a VLAN? A VLAN splits one office network into several separate ones on the same cables. What it is used for, and the equipment it needs. Intermediate 3 min read

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