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The Pigpen cipher (a.k.a. tic-tac-toe cipher) is a geometric substitution cipher, which exchanges letters for symbols which are fragments of a grid. Secret Message Using the key provided on the right, can you decode the following secret message? Pigpen…
The rail fence cipher (sometimes called zigzag cipher) is a transposition cipher that jumbles up the order of the letters of a message using a basic algorithm. The rail fence cipher works by writing your message on alternate lines across…
Flag semaphore is a telegraphy system conveying information at a distance by means of visual signals with hand-held flags. Information is encoded by the position of the flags. The current flag semaphore system uses two short poles with square flags,…
In this challenge we will use the Luhn Algorithm to check if a debit card or credit card number is a valid card number. This method is used every time you scan or enter your credit card number (e.g. when…
Extension Task Using the same approach, we can encode message in a range of encoding schemes such as Hexadeximal (4-bits per character), Base32 (5 bits per character), Base64 (6 bits per character), Extended ASCII (8 bits per character). You can…
Look at the logic gates diagrams below. For each of these diagrams, complete the Truth Table corresponding to the diagram. Can you name the logic gate that each diagram is equivalent to? Check Your Answers You can now recreate these…
The aim of this challenge is to write a script that allows the user to input the equation of two straight lines (Line 1: y=ax+b, Line 2: y=cx+d). The program will then calculate the coordinates of the intersection point if…
In this challenge we will use Python Turtle to draw the track of a roller coaster. We have created three procedures for you to use when drawing the track. Each procedure takes two parameters as follows: straightLine(distance, speed): To draw…
A triangular number correspond to the number of dots that would appear in an equilateral triangle when using a basic triangular pattern to build the triangule. The triangular numbers sequence contains all the triangular numbers in order. The first 10…
A triangular number correspond to the number of dots that would appear in an equilateral triangle when using a basic triangular pattern to build the triangule. The triangular numbers sequence contains all the triangular numbers in order. The first 10…
LMC Simulator
Logic Gates Circuits
Network Designer
Flowchart Studio
Online Python IDE