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🔑 How does a password get hashed

How does a password get hashed — mechanism, parts, and limits in plain language.

3
lessons
~10 min
to learn
🔢 Math
subject
Adults
level
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What you’ll learn

  1. Why Sites Should Not Store Your PasswordExplain password hashing as one-way verification without recoverable storage.Hashes let servers check secrets without keeping the secrets; encryption-with-reversal is the wrong model for password files.
  2. Salts, Slow Hashes, and ParametersDescribe salts, slow password KDFs, and evolving work factors.Unique salts block rainbow bulk lookup; intentional slowness and tunable parameters raise guessing cost over time.
  3. What Hashing Does Not SolveBound hashing against weak passwords, phishing, and newer passkey models.Hashing is necessary storage hygiene, not a cure for guessable secrets or secrets typed into the wrong site.

Questions this course answers

Why do well-designed services store a password hash instead of the password itself?

A one-way hash lets the server check a typed password by comparison without storing a decryptable original, limiting damage if the database leaks.

Match each password-storage idea to its job.

Salts break shared precomputation; slow hashes and work factors throttle offline attacks as machines get faster.

In your own words, why does hashing not stop phishing?

Hashing protects credentials at rest on the real server. If you submit the password to an attacker first, they already have the plaintext secret.

Grounded in trusted sources

  • NIST Digital Identity Guidelines (password and authenticator guidance overview)
  • OWASP Authentication Cheat Sheet and Password Storage Cheat Sheet
  • Argon2 / bcrypt / PBKDF2 specification and IETF materials (password-based KDFs)
  • Google / FIDO Alliance educational materials on passkeys (public-key site login)

Every Wunder lesson is built from real, reputable sources — never invented.

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