Cyber security

2:08 Lesson 1 Security, privacy and integrity Three words get used as if they meant the same thing, and the exam asks you to separate them. Security i… 2:10 Lesson 2 Malware Malware is any program written to harm a computer or steal from it, and the exam names six kinds. Six na… 2:06 Lesson 3 Attacks and brute force Beyond malware, attackers go at a system directly. A brute-force attack tries every possible password un… 2:00 Lesson 4 Social engineering Everything so far has attacked the machine. But the weakest part of a system is usually not the machine … 2:04 Lesson 5 Defending a system Defences are usually given as a list, and that hides the point. Draw them as rings instead. An attacker … 2:05 Lesson 6 Passwords and authentication A password proves that somebody knows a password. Getting from there to proving they are who they say th… 2:08 Lesson 7 Storing passwords safely Start with what must never happen. If a site stores passwords as plain text and is breached, every passw… 1:43 Lesson 8 Encoding is not encryption People say "encoded" when they mean "encrypted", and the two are not the same thing. Encoding changes th… 2:07 Lesson 9 Symmetric encryption Scrambling a message is the easy half. The hard half is that whoever unscrambles it needs something you … 2:08 Lesson 10 Asymmetric encryption Last lesson ended on a problem: you must share the secret key first. Asymmetric encryption answers it by… 1:34 Lesson 11 Hashing and digital signatures In lesson seven we hashed passwords for secrecy. The same function does a second job: it protects integr… 2:05 Lesson 12 HTTPS, TLS and certificates Start with something you look at every day. When the address begins with H T T P S and a padlock appears… 1:34 Lesson 13 Data integrity Secrecy is not the only thing that can fail. A message nobody managed to read can still arrive changed. … 2:01 Lesson 14 SQL injection Most apps look up a user by building a query out of a string. You type your name into a box, and the app… 1:59 Lesson 15 Access control and least privilege Most breaches are not somebody breaking in. They are somebody already inside, reaching further than thei… 2:13 Lesson 16 Ethics, law and staying safe You have spent fifteen lessons learning how attacks work, and that knowledge comes with a duty. A comput…