Tech WondersPlay

Zone 4

Cipher Vault

Nine lessons of about three minutes each, every one with a live demo and a quick test.

  • Codes, Cryptography & Blockchain×4
  • The Internet & Web
  • Security & Scams
  • Quantum & Relativity
  • Energy, Heat & Motion
  • Inside the Computer
Play this zone
  1. 28Web TechnologyThe Cookie JarA tiny note lets a website remember you were here
  2. 29Account SecurityTwo-Factor LoginA stolen password is nearly useless without the second key
  3. 30Classical CryptographyCaesar's CipherJulius Caesar hid messages by shifting every letter three places
  4. 31CodebreakingCounting Letters Breaks CodesA 9th-century scholar cracked substitution ciphers with a tally chart
  5. 32Classical CryptographyThe Unbreakable Cipher That BrokeVigenère's code was called indecipherable for 300 years
  6. 33CryptographyThe Secret HandshakeTwo strangers can agree on a secret while everyone listens
  7. 34Quantum PhysicsThe Quantum TunnelParticles can cross walls they can't climb, and your phone's memory relies on it
  8. 35Energy StorageWhy Your Battery Wears OutHeat, full charges and empty batteries age your phone fastest
  9. 36Data StorageWhy Your 1 TB Drive Shows 931 GBDrive makers and computers count bytes differently