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Key Derivation Function

Key Derivation Function (KDF) ek cryptographic function hai jo ek secret value (jaise password,…

Overview

Key Derivation Function — Quick Facts

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Property: Detail

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Full Name: Key Derivation Function (KDF)

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Type: Cryptographic Primitive / Function

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Category: Cryptography, Key Management,…

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Full Name | Key Derivation Function (KDF) | | Type |…

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Simple Explanation — KDF Kya Hai

💡 Sochlo tumhare paas ek chhabi (key) hai jo bahut simple si hai — jaise "password123". Ab…

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Kyun Zarurat Hai — The Problem

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Short passwords = easy to…

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Same password = same ciphertext…

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No defense against pre-computed…

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History aur Evolution

⭐ | Year | Development | Significance | |---|---|---| | 1970s | Unix crypt() function |…

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KDF Categories — Two Types

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Intentionally slow (prevent…

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Salt required (prevent rainbow…

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Configurable cost (adjust for…

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Memory-hard (modern ones — prevent…

Topic 6

Key Stretching — Core Concept

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Normal hash (SHA-256): 1 password…

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KDF with stretching: 1 password =…

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Ye 100 million times difference…

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Salt — Uniqueness Guarantee

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Length: Minimum 16 bytes (128…

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Source: Cryptographically Secure…

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Uniqueness: Globally unique per…

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Storage: Salt ke saath hash store…

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PBKDF2 — Password-Based KDF 2

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Full Name: Password-Based Key…

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Standard: RFC 2898 / RFC 8018 /…

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Published: 2000

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Algorithm: HMAC iterated N times

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bcrypt — Blowfish-based Password Hashing

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Authors: Niels Provos, David…

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Published: 1999 (USENIX)

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Based On: Blowfish cipher's…

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Output: 60-character string…

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scrypt — Memory-Hard KDF

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Author: Colin Percival

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Published: 2009

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Key Innovation: Memory-hard…

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Standard: RFC 7914

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Argon2 — Modern Winner

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Authors: Alex Biryukov, Daniel…

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Published: 2015

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Award: Password Hashing…

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Standard: RFC 9106

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HKDF — HMAC-based KDF

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Full Name: HMAC-based…

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Standard: RFC 5869

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Author: Hugo Krawczyk

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Purpose: Derive keys from…

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KDF Comparison Table

🔑 | Feature | PBKDF2 | bcrypt | scrypt | Argon2id | HKDF | |---|---|---|---|---|---| | Year…

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KDF Security Parameters

✨ Threat Model Evolution | Era | Attacker Hardware | PBKDF2 Iterations Needed | bcrypt Cost…

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Attack Resistance Analysis

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KDF in Password Storage

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Algorithm identifier (argon2id)

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Version (v=19)

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Parameters (m=65536, t=3, p=4)

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Salt (base64 encoded)

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KDF in Disk Encryption

📚 How Disk Encryption Uses KDF 1. User enters passphrase at boot 2. KDF (PBKDF2/Argon2)…

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KDF in TLS/SSL aur Key Agreement

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Client handshake traffic key

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Server handshake traffic key

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Client application traffic key

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Server application traffic key

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KDF in Cryptocurrency

🎯 | Cryptocurrency | KDF | Purpose | |---|---|---| | Bitcoin | PBKDF2 (BIP39) | Mnemonic…

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KDF Workflow — Mermaid Diagram

⭐ `mermaid flowchart TD A[User Password<br/>Low Entropy] --> B[Generate Random…

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Password Hashing Architecture — Mermaid Diagram

🔑 `mermaid sequenceDiagram participant User participant App as Application Server…

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Implementation Guidelines

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Use Argon2id for new applications…

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Use bcrypt agar Argon2 available…

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Use PBKDF2 sirf jab FIPS/NIST…

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Use HKDF for key derivation from…

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Common Mistakes aur Vulnerabilities

🌟 | Mistake | Risk | Correct Approach | |---|---|---| | Plain SHA-256(password) | Instant…

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Recommended Parameters (2025+)

🚀 | KDF | Parameter | Recommended Value | Notes | |---|---|---|---| | Argon2id | Memory (m)…

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Future Trends — Post-Quantum aur Beyond

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Brute-force: Grover's algorithm…

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KDF impact: 256-bit output →…

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Mitigation: Use 512-bit output…

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Timeline: Practical quantum threat…

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Disclaimer

💡 Ye article Aliens Wiki ke liye Hinglish (Roman) me likha gaya hai. Ye ek educational…

Comparison

KDF Comparison Table

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Year: 2000

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Standard: NIST/RFC 8018

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For Passwords: Yes

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Key Derivation Function ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Key Derivation Function ka 'Full Name' kya hai?

Complete! 🎉

Key Derivation Function Complete!

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Key Derivation Function Complete

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