The Vatsyayana cipher is a simple substitution cipher where the 26 letters of the alphabet are organised into 13 pairs of characters. These pairs are then used to encrypt the text by direct substitution of the letters in the pairs.…
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Caesar Shift (Substitution Cipher)
A Caesar Shift cipher is a type of mono-alphabetic substitution cipher where each letter of the plain text is shifted a fixed number of places down the alphabet. For example, with a shift of 1, letter A would be replaced…
Frequency Analysis
In cryptography, frequency analysis is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking substitution ciphers (e.g. mono-alphabetic substitution cipher, Caesar shift cipher, Vatsyayana cipher). Frequency…
Mono-Alphabetic Substitution Cipher
A mono-alphabetic cipher (aka simple substitution cipher) is a substitution cipher where each letter of the plain text is replaced with another letter of the alphabet. It uses a fixed key which consist of the 26 letters of a “shuffled…
Shuffling a 2D Array
For this challenge we will investigate how to create a 2D array to store the value from 1 to 100 in a 10×10 array. We will then write an algorithm to shuffle the content of this array. See the code…
Shuffling Algorithm
Our aim is to implement a shuffling algorithm to shuffle a deck of playing cards. To do so, we will use a list called deck to store the 52 cards of the deck as follows: deck = ["Ace of hearts","2…
Boggle Challenge
Boggle is a word game based on a 4×4 grid of 16 letters. Each time the game is played a new grid is generated. In the real game this is done by shaking a cube that contains 16 letter dice.…
Computer Networks Crossword
Are you confident with your knowledge of network design concepts? Can you identify the purpose of the main network components used to set up a LAN or a WAN? You can find out more about key network design concepts on…
What 3 Words Localisation
What3words is a geocode system used to communicate a location on planet Earth using only 3 words instead of using complex longitude and latitude coordinates. What3words have assigned each 3m square in the world a unique 3-word address that will…
String Slicing in Python
String? In computer science, a string is a piece of text or a collection of characters. String Length? The length of a string represents the number of characters it contains. In pyhon you can use the function len() to find…
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