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

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#cryptology, #cryptography, #cryptanalysis

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

This second video in a series about cryptology gives an overview of the basic terminology of cryptanalysis (focusing on classical ciphers). It explains different general types of attacks (chosen-plaintext attack, (partially) known-plaintext attack, and ciphertext-only attack). Additionally, we have a look at language models and we also break a monoalphabetic substitution cipher as well as a transposition cipher by hand.Finally, we have a look at text frequencies in CrypTool 2.

In upcoming videos we will have a look at modern ciphers as well as on modern cryptanalysis.

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I cant stop watching this, keep going on the play list

mucomplex

Sir, i truly admire your great work on Cryptool! It's an awesome program for the cryptanalysis! Thank you!

Micantropo

This tool is very helpful to those who want to learn cryptography. Thank you very much for sharing it with us!

Q: Where u have uploaded the task 2 ?

Q: Why we won't secret the cipher with a key ? eventough keyspace is limited in some cases & attacker can try bruteforce if it's feasible or can go with other frequency distribution or other lingustic characterstics attacks but predicting the cipher would be challenging & it takes too much time span so why we won't keep the cipher secret along the key?

hassaanraheem

Thanks Nils. I'm really enjoying binging your channel. I was wondering, with the English letter frequency distribution, is there a noticeable difference between British and US English with respect to the Z? In Britain, we often use an S in places where the US would use a Z. For example, in the US, they use words such as civilized, naturalized, etc. Maybe there aren't enough words for this difference to affect the percentages much. Thanks.

jonkirk

Is there a way to do a frequency test to show the number of times each character appears as opposed to the percentage?

galloe

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

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

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