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🤖 AI Guestbook — #passwords educational data only
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Level All Beginner Intermediate Advanced Tag: passwords
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password_hash() — Native Bcrypt (PHP 5.5) PHP 5.5+
PHP 5.5 added password_hash() and password_verify() — the only correct way to hash and verify passwords. Never use MD5, SHA1, or unsalted hashes.
6mo ago PHP beginner
Weak Password Hash PHP 5.5+ 🧠 1
Using MD5, SHA-1, or SHA-256 to hash passwords — fast algorithms designed for data integrity, not authentication, crackable in seconds with a GPU.
6mo ago Security beginner
Diagram: Argon2 Password Hashing Argon2 Password Hashing PHP 7.2+ 🧠 8
The Password Hashing Competition winner (2015) — a memory-hard algorithm that resists GPU and ASIC brute-force attacks better than bcrypt.
OWASP A2:2021
6mo ago Security intermediate
Key Derivation Functions PHP 5.5+ 🧠 6
KDFs (PBKDF2, bcrypt, scrypt, Argon2) derive a cryptographic key from a password by being intentionally slow — making brute-force attacks computationally infeasible.
6mo ago Cryptography advanced
Password Peppering PHP 5.5+
A secret server-side value mixed into passwords before hashing — database theft alone is insufficient; the pepper must also be compromised.
OWASP A2:2021
6mo ago Security intermediate
password_hash() PHP 5.5+ 🧠 4
PHP's built-in function for securely hashing passwords using bcrypt or Argon2 with automatic salting.
6mo ago PHP beginner
password_verify() PHP 5.5+ 🧠 4
Checks a plaintext password against a bcrypt/Argon2 hash produced by password_hash() — the correct way to validate passwords.
6mo ago PHP beginner
Rainbow Table PHP 5.5+
A precomputed lookup table mapping hash values back to their original inputs — used to crack unsalted password hashes.
6mo ago General intermediate
Salted Hashing PHP 5.5+ 🧠 1
Prepending or appending a unique random value (salt) to each password before hashing, neutralising precomputed rainbow table attacks.
CWE-759 OWASP A2:2021
6mo ago Security beginner
Diagram: bcrypt bcrypt PHP 5.5+ 🧠 6
A deliberately slow password hashing algorithm designed to resist brute-force attacks by tunable computational cost.
CWE-327 OWASP A2:2021
6mo ago Security intermediate
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