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World 2 · Passwords and the Mathematics of Guessing · 13 min · PRO

Passphrases and managers

Easy to remember, hard to guess

PRO · Cyber Defense Lab

World 2: Passwords and the Mathematics of Guessing is part of PRO

The first world of Cyber Defense Lab is free. PRO opens the other 20 lessons in 5 worlds — simulations, quizzes and all.

  • Length and entropy
  • How fast can a guess go?
  • Second factors and passkeys
  • Anatomy of a phishing message
  • Reading a link
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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