Basics of Cryptology – Part 3 (Modern Symmetric Ciphers – Stream Ciphers & Block Ciphers)

Показать описание

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

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

This third video in a series about cryptology gives an introduction to modern symmetric ciphers. We first present the basics of modern ciphers. Then, we show the basic ideas of stream and block ciphers. Finally, we present two different block modes (of operation) for modern block ciphers, namely electronic code book (ECB) mode and cipher block chaining (CBC) mode. We also present stream and block ciphers (and how to create workspaces for these) in CrypTool 2. Additionally, we show why using ECB mode is a bad idea and one should prefer CBC mode (despite, that CBC has other flaws and should be replaced by more modern block modes - details on these in later videos).

Hint: Both modern ciphers shown in this video, RC4 and DES, should not be used any more for encryption in applications. RC4 is broken and pure DES (56bit key length) can be broken with special hardware or computing clouds within a few hours.

In upcoming videos we will have a look at building blocks of modern symmetric ciphers as well as on asymmetric ciphers.

Рекомендации по теме

Комментарии

I really like to stay in front of you and shake your hand. Excellent serie. Objective, clean and easy to understand. Thank you so much for sharing your knowledge.

creonte

I'm currently learning about Cryptology for my MSC course - your videos are 100x better than how the lecturer explains it :)

KamiKze

Hi, does Cryptool2 supports AES-XTS, can you provide an example,

berlerd

Hi,
One question, I can't find what is padding 1 -0, is there a standard or could you tell me how it pads? On the other hand, is there any function that will padding a text string or bytes before going to the encryptor? Thanks for your help

felipinrodriguez

Basics of Cryptology – Part 3 (Modern Symmetric Ciphers – Stream Ciphers & Block Ciphers)

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 2 (Cryptanalysis – Terminology & Classical Ciphers)

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

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)

Basics of Cryptology – Part 7 (Modern Cryptography – Perfect Ciphers and One-Time Pad)

Basics of Cryptology – Part 16 (Modern Cryptography – The Avalanche Effect)

Basics of Cryptology – Part 22 (Cryptography – Kerckhoffs' Principle & Modern Cryptographic...

Basics of Cryptology – Part 24 (Cryptography – Block Cipher Modes of Operation)

Basics of Cryptology – Part 19 (Cryptanalysis – Unicity Distance & Check and Proof Cipher Soluti...

Basics of Cryptology – Part 4 (Modern Cryptanalysis – Shannon's Entropy and Brute-Force Attack)...

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

Basics of Cryptology – Part 12 (Modern Asymmetric Cryptography – Diffie-Hellman Key Exchange)

Basics of Cryptology – Part 17 (Cryptography/Cryptanalysis – Keyspace and Keyspace Size)

Basics of Cryptology – Part 13 (Modern Cryptography – Cryptographic Hash Functions)

7 Cryptography Concepts EVERY Developer Should Know

Basics of Cryptology – Part 21 (Cryptanalysis – The Index of Coincidence (IoC))

Basics of Cryptology – Part 8 (Modern Cryptanalysis of Classical Ciphers – Hill Climbing)

The Science of Codes: An Intro to Cryptography

Cryptography 101 - The Basics