Free Course — No signup required

Learn Cryptography
in 5 Days

Understand how encryption, hashing, and certificates actually work — then apply them correctly.

5 lessons
Self-paced
~60 min/day
Free forever
No account needed
Start Day 1 — Free → See what's covered
What you'll learn

Cryptography in 5 Days

Free 5-day cryptography course. Symmetric encryption, asymmetric keys, hashing, TLS, and practical applications.

  • Understand symmetric encryption: AES block cipher, modes of operation, key management
  • Master asymmetric cryptography: RSA, elliptic curves, key exchange with Diffie-Hellman
  • Use cryptographic hash functions: SHA-256, bcrypt for passwords, HMAC for integrity
  • Trace a TLS 1.3 handshake: certificates, certificate chains, and forward secrecy
  • Apply crypto correctly: when to use which algorithm, common pitfalls, and key storage
AES
symmetric
RSA/ECC
asymmetric
TLS 1.3
transport
$0
cost
5-Day Curriculum

Every lesson builds on the last.
No theory without practice.

01
Symmetric Encryption
AES, block modes (CBC/GCM), padding, IV, key size
AESGCMCBCIV
→
02
Asymmetric Cryptography
RSA, ECC, ECDH key exchange, digital signatures
RSAECCECDHsignatures
→
03
Hashing
SHA-256, SHA-3, bcrypt, Argon2, HMAC, MAC
SHA-256bcryptArgon2HMAC
→
04
TLS in Depth
Certificate chains, TLS 1.3 handshake, HSTS, pinning
TLS 1.3X.509HSTScertificate
→
05
Applied Cryptography
Key storage, envelope encryption, common mistakes
KMSenvelopemistakesHSM
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems at scale. Every lesson has concrete examples and exercises you can finish in under an hour.

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