Crack the Code: The Fascinating World of Cryptography
Discover the intriguing world of cryptography through a journey into the history and methods of code-making and code-breaking. Uncover the importance of codes in everyday life, from book ISBNs to encrypted internet data, and learn about classic techniques like Caesar shifts. Test your skills by decoding messages using Caesar shifts and explore the secrets behind the art of cryptography.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
E N D
Presentation Transcript
CAN YOU CRACK CAN YOU CRACK THE CODE? THE CODE? There is a long history of mathematicians being used in code making and code breaking - the most famous is probably the Bletchley Park code breakers, where some of the most brilliant mathematicians in the country such as Alan Turing worked in secret to crack the German WWII Enigma code. The code was so complicated that the Germans were confident that it was unbreakable, however the men and women at Bletchley Park were able to crack it using incredible ingenuity. This meant that the allies were able to intercept and understand German communications a huge breakthrough in the war.
Codes now play an integral part in all our lives Codes now play an integral part in all our lives - - from the ISBN codes on the back of every book from the ISBN codes on the back of every book you buy, to the algorithm that checks if the credit you buy, to the algorithm that checks if the credit card you've entered is genuine, from the card you've entered is genuine, from the encrypted data sent via the internet to the encrypted data sent via the internet to the content you watch on digital TV. content you watch on digital TV. In the next few weeks, I will introduce you to different types of code. See if you can crack the codes to decipher the messages. Send your solution to me, and I ll send you a new code. This code appeared in This code appeared in The Telegraph The Telegraph newspaper in newspaper in November last year. November last year. The first 20 people to The first 20 people to solve it were invited to solve it were invited to a secret party! a secret party! If you are a confident codebreaker have a go at these online challenges: http://ibmathsresources.com/code-challenge/ The solution to the first code gives you the password to access the next puzzle, there are 5 to solve in total in each set. Let me know how far you get take a photo and email me!
Caesar Shifts Caesar Shifts The Caesar Shift is one of the most simple codes in cryptography. It is a substitution code, which means that each letter is replaced with another one. The code is named after the Roman Emperor Julius Caesar who used this method to send military messages to his army. To encrypt or decrypt a Caesar shift we first list the alphabet, and then for a Caesar shift of three, we move every letter of the alphabet 3 places: Caesar shift codes can be easily broken. If you count the frequency of each of the letters in the code, you can then compare these frequencies with how often they appear in English. Here we would decode A as X, B as Y etc. So KHOOR translates to HELLO In a long message the letter which appears the most we would expect to correspond to the letter E. If that fails, try T or A. VOCABULARY Cryptography, or cryptology, is the practice and study of hiding information. It is sometimes called code, but this is not really a correct name. It is the science used to try to keep information secret and safe.
CAESAR SHIFT CAESAR SHIFT Use Caesar shifts to decode these messages: BRX QHHG D GLIIHUHQW VKLIW IRU WKH QHAW WZR FRGHV ZLKDOXQRIXQFLKP VLR EXSB ZOXZHBA QEB ZXBPXO PEFCQ ZLAB DOHA PZ AOL MPMAO AYPHUNBSHY UBTILY Send your solutions to me to receive the next code. Feel free to send me a coded message using a Caesar shift. I love cracking codes!!
