# 15. Layanan Kriptografi

Modul-modul yang dideskripsikan di bagian ini mengimplementasikan berbagai algoritma dunia kriptografi. Mereka (modul-modul) tersedia bebas saat pemasangan. Pada sistem Unix, modul `crypt` mungkin saja tersedia. Berikut ini ikhtisar:

- 15.1. `hashlib` --- Secure hashes and message digests
  - 15.1.1. Hash algorithms
  - 15.1.2. SHAKE variable length digests
  - 15.1.3. Key derivation
  - 15.1.4. BLAKE2
    - 15.1.4.1. Creating hash objects
    - 15.1.4.2. Konstanta
    - 15.1.4.3. Contoh-contoh
      - 15.1.4.3.1. Simple hashing
      - 15.1.4.3.2. Using different digest sizes
      - 15.1.4.3.3. Keyed hashing
      - 15.1.4.3.4. Randomized hashing
      - 15.1.4.3.5. Personalization
      - 15.1.4.3.6. Tree mode
    - 15.1.4.4. Credits
- 15.2. `hmac` --- Keyed-Hashing for Message Authentication
- 15.3. `secrets` --- Generate secure random numbers for managing secrets
  - 15.3.1. Random numbers
  - 15.3.2. Generating tokens
    - 15.3.2.1. How many bytes should tokens use?
  - 15.3.3. Other functions
  - 15.3.4. Recipes and best practices