التجزئة والتمليح والتجزئة البطيئة

في هذا الدرس

explain why passwords are hashed, salted, and hashed slowly.

الموضوعات المخطط لها

• Encryption can be reversed with a key. Hashing is one-way; you store the hash, never the password.
• To log in, hash the attempt and compare.
• A salt is random data added per user, so equal passwords get different hashes and precomputed tables fail.
• Fast hashes (MD5, SHA-256) let attackers try billions of guesses per second. Password hashes are deliberately slow and costly: bcrypt, scrypt, Argon2.
• The slowness is tunable (cost factor) and can be raised over time.