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Cryptography · Module 10 of 10

Applied cryptography and careers

Use crypto correctly in real systems.

📖 Key ideas

  1. Never invent your own crypto; use vetted libraries (libsodium, cryptography, Web Crypto API).
  2. Use high-level APIs that choose safe defaults.
  3. Common uses: HTTPS, encrypted storage, signed tokens (JWT), password hashing.
  4. Blockchains use hashing and digital signatures.
  5. Careers: security engineer, cryptographer, PKI engineer; study math, CS and standards.
💡 Real-life example: Using crypto libraries is buying a certified lock instead of welding your own.
libsodiumEasy-to-use crypto library
Web Crypto APIBrowser cryptography API
JWTSigned token format
Vetted libraryWell-reviewed implementation