Cryptography

Lessons

1. 1

   What Cryptography Protects

   Free

   Understand confidentiality, integrity, and authenticity, and the three families of primitives that provide them.

   Beginner·20 min
2. 2

   Symmetric Encryption: AES and Modes

   Use AES-256-GCM correctly: block vs stream ciphers, modes of operation, why ECB is broken, and IV/nonce management.

   Intermediate·45 min
3. 3

   Asymmetric Encryption: RSA and ECC

   Explain public/private key pairs, RSA, elliptic curve cryptography, and why ECC is preferred for new systems.

   Intermediate·45 min
4. 4

   Hash Functions and HMAC

   Explain collision and pre-image resistance, length-extension attacks, and why HMAC beats naive keyed hashing.

   Intermediate·40 min
5. 5

   Key Exchange and Digital Signatures

   Explain Diffie-Hellman and ECDH key agreement and how digital signatures (RSA, ECDSA) prove authenticity and integrity.

   Intermediate·40 min
6. 6

   TLS in Depth

   Walk the TLS 1.3 handshake, forward secrecy, certificate validation, and the CA trust model and its weaknesses.

   Intermediate·45 min
7. 7

   Practical Cryptography for Developers

   Choose the right primitive and library (libsodium, Web Crypto, Python cryptography) and know what never to implement yourself.

   Intermediate·40 min
8. 8

   Cryptography Job Readiness

   Translate cryptography fluency into job titles, a resume, interview answers, certifications, and a portfolio checklist.

   Intermediate·25 min