PRFs explained: Transforming Secrets into Infinite Keys - Pseudo Random Functions
In this video we explore the world of Pseudo Random Functions (PRFs) and reveal the role they play in secure communication. PRFs are essential cryptographic operations that generate arbitrary length bit stream outputs from input values, playing a crucial role whenever you connect to a secure website.
We start by comparing PRFs to hashing algorithms, highlighting their similarities and differences, and then offer a comprehensive definition of a PRF. You'll learn how PRFs transform a single secret key into multiple secret keys, making them invaluable for tasks like symmetric encryption and message authentication codes (MACs).
We also touch upon Key Derivation Functions (KDFs), a more secure but slower variant of PRFs, and explain their importance in scenarios like password storage. By the end of this lesson, you'll have a clear understanding of how hashing algorithms, PRFs, and KDFs function and differ from one another.
#prf #kdf #pseudo-random #rng #cryptographicsystems #tls #ipsec
// CHAPTERS: //
00:00 - Intro
00:23 - PRFs vs Hashing Algorithms
01:05 - Pseudo Random Function - Explained
01:38 - Purpose of a PRF
03:10 - Input to a PRF
04:14 - KDF - Key Derivation Function
05:28 - Why use Salt? Why intentionally slow down an operation?
07:06 - Hashing vs PRFs vs KDFs
// FULL SERIES - Cryptography Essentials //
This video is part of a 16-part series covering the essentials of modern Cryptography. Explained simply, and technically accurate.
The full series is available here:
📋 • Cryptography Essentials
( or use the shortcut pracnet.net/ce )
00 Series Introduction
01 Hashing
02 Keys / Secret Keys
03 Symmetric Cryptography
04 Encryption
05 MAC / HMAC
06 Pseudo Random Function
07 Asymmetric Cryptography
08 Asymmetric Encryption (RSA)
09 Signatures
10 RSA Signatures
11 DSA Signatures
12 Key Exchanges
13 RSA Key Exchanges
14 DH Key Exchanges
15 Elliptic Curve Cryptography
// ADDITIONAL RESOURCES //
Hashing:
• Hashing and Hashing Algorithms - md5 ...
Secret Keys:
• Understanding Secret Keys: A Simple E...
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