Basics of Cryptology – Part 5 (Modern Cryptography – Stream Ciphers – RC4)

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#cryptology, #cryptography, #cryptanalysis, #lecture, #course, #tutorial

In this video, we show the basics of cryptology (cryptology = cryptography and cryptanalysis).

This particular video shows in detail how the modern stream cipher RC4 works.

First, we discuss in detail the internal workings of RC4 and give a brief overview of its invention.

Then, we show a visualization of RC4 in JCrypTool (10:04). Finally, we use CT2 (from 13:04) to encrypt and decrypt text using RC4. Here, we also show what happens, if you change a byte in the plaintext, ciphertext, or in the key.

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A very good explanation on how RC4 works. Thanks.

bernhardesslinger

Thanks for this amazing vídeo. I hope you stay safe!

creonte

hello, I don't know what I have to confront the XOR to the encrypted frame so that it returns the keystream

joseAn-bq

Great video, thanks a lot! There's something I didn't understand- why do we need the KSA algorithm? Can't we just feed the PRGA with the key directly to create a keystream as long as the plaintext?

tomgi

Basics of Cryptology – Part 5 (Modern Cryptography – Stream Ciphers – RC4)

Basics of Cryptology – Part 1 (Cryptography – Terminology & Classical Ciphers)

Basics of Cryptology – Part 18 (Cryptography – Random Number Generators)

Basics of Cryptology – Part 23 (Cryptography – Modern Hybrid Encryption)

Basics of Cryptology – Part 15 (Modern Cryptanalysis – Rainbow Tables)

Basics of Cryptology – Part 2 (Cryptanalysis – Terminology & Classical Ciphers)

Basics of Cryptology – Part 14 (Modern Cryptography – Passwords)

Basics of Cryptology – Part 20 (Cryptanalysis – Cost & Fitness Functions - Language Models)

Basics of Cryptology – Part 25 (Cryptography – Block Cipher Padding)

Basics of Cryptology – Part 10 (Modern Cryptanalysis of Classical Ciphers – Genetic Algorithm)

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