encryption - Substitution Cipher vs. Permutation Cipher
Jan 25, 2017 · What is the difference between Substitution Cipher and Permutation Cipher? In a substitution cipher I have seen that there is a random choice of 26 alphabet characters for …
permutation - How to solve Columnar Transposition Cipher …
Oct 22, 2016 · How to solve Columnar Transposition Cipher without a key Ask Question Asked 9 years, 2 months ago Modified 8 years, 7 months ago
Security of permutation cipher - Cryptography Stack Exchange
You can compute $\sigma_1^ {-1} (Ciphertext)$, and that gives you essentially a simple substitution cipher within each generation; solving a substituion cipher given 256 bytes of …
Apply a permutation cipher by hand - Cryptography Stack Exchange
Feb 9, 2017 · I did the following problem from the book "Cryptography Theory and Practice" as I am doing some self-study. Problem: a) Suppose that $\\pi$ is the following permutations of the …
Correct way to read a given permutation cipher?
In some literature I am reading – where they are explaining the permutation cipher – they have two examples, which encrypt a small block of text. But they seem to contradict each other: …
The exact difference between a permutation and a substitution
I've noticed confusing definitions about permutation and substitution, preventing me from understanding the difference. A permutation changes the order of distinct elements of a set, …
stream cipher - Permutation and modes of operation
Dec 9, 2018 · A mode of operation is an algorithm that uses a permutation to process messages of arbitrary size. But when I search about "mode of operation", I only found "block ciphers" …
What's the difference between permutation and transposition?
Nov 27, 2021 · 0 I am trying to understand the difference between permutation and transposition. I have seen a similar question in the forum but I would like to ask you for proper definitions and …
What is the difference between a permutation and a shuffle ...
Nov 6, 2020 · The Wikipedia article on Random permutation states that "A good example of a random permutation is the shuffling of a deck of cards: this is ideally a random permutation of …
cryptanalysis - Double permutation patterns for transposition …
Sep 27, 2020 · Is there any case the above method will not work, and is there any better method to crack this permutation cipher? Also, what if I use two-permutation patterns, for example; for …