[center][b][size=150]Crack the Code![/size][/b][/center]

[size=150][left][br]At the end of the lesson, the students are expected to:[/left][/size][list][*]Understand the concept of ciphering and its historical significance[/*][*]Recognize and apply basic ciphers, such as the Caesar cipher, to encode and decode messages[/*][*]Relate ciphering to real-world applications, including digital safety and data protection[/*][*]Engage in mathematical activities that involve using ciphers to solve arithmetic problems[/*][*]Participate in a physical activity where they decode math-related messages to complete a challenge[/*][*]Engage in an engineering activity and design and create a simple cipher wheel by using craft materials.[br][/*][/list]

[br][br][list][*]Pictures with examples of the Caesar cipher[/*][*]presentation[/*][*]worksheet with math problems[/*][*]Caesar cipher key with a shift of three (provided on the worksheet)[/*][*]pre-written encrypted messages[/*][*]math problem cards[/*][*]cones or markers to set up a relay path[/*][*]cardboard or thick paper[/*][*]scissors[/*][*]brass fasteners[/*][*]markers[/*][*]ruler and compass[/*][*]alphabet templates[/*][/list]

[br][b]1. Why Do People Use Ciphers?[br][/b][br][justify]Starting the lesson by discussing with students how communication has evolved. Explaining that as soon as people began exchanging information, there was a need to protect certain messages from being understood by everyone, especially during times of war or when communicating sensitive information. Posing the questions like:[/justify][list][*]“Why do you think people would want to hide messages?”[/*][*]“Can you think of a situation where you’d want to keep something secret?”[br][/*][/list][b][br]2. Fun Historical Example[/b][br][br][list][*][b]Caesar Cipher:[/b] Sharing the story of Julius Caesar, who used a simple letter-shifting method to protect his military communications.[br][/*][*]"Caesar would shift each letter of his message by three places in the alphabet. For example, 'A' would become 'D', 'B' would become 'E', and so on. So, if he wanted to say ‘HELLO,’ it would turn into ‘KHOOR’. Anyone who intercepted the message wouldn’t be able to read it easily."[/*][*]Using the presentation to show how shifting letters works. Letting the students try it themselves with a simple message like "THIS IS FUN".[/*][/list][b]3. Other Famous Ciphers:[/b][br][list][*][b]Substitution Cipher:[/b] Explaining how each letter in the alphabet is substituted with another letter or symbol. Using a pre-made cipher key to show this.[/*][*][b]Enigma Machine: [/b]Briefly mentioning how, during World War II, people used complex machines to encode and decode messages. Showing a picture of the Enigma Machine to give students an idea, but keeping the explanation simple.[/*][/list]

[br][list][*]Handing out a list of simple encoded messages using the Caesar cipher and substitution cipher. For example:[br]* Letting students work in pairs to decode these messages. Once they’ve cracked the codes, ask them to create their own encoded messages using the same ciphers and swap with their classmates to solve[/*][/list][list][*] Handing out a list of simple encoded messages using the Caesar cipher and substitution cipher. For example: [list][*] Caesar Cipher (shift of 3): "FRZHUW WRPDB" (Answer: "CRYPTO TODAY")[br][/*][*] Substitution Cipher: "4PP13" (Answer: "APPLE")[br][/*][/list][/*][*] Letting students work in pairs to decode these messages. Once they’ve cracked the codes, ask them to create their own encoded messages using the same ciphers and swap them with their classmates to solve.[br][/*][/list][br][br][b]Linking to Digital Safety[br][/b][br]1. Modern Encryption: A short discussion on digital safety by comparing these simple ciphers to modern encryption methods.[justify]“Today, we use complex math to scramble information on the internet. Just like Caesar didn’t want his enemies to read his messages, we don’t want hackers or strangers to read our private emails or see our personal photos.”[/justify][br][br]2. Everyday Encryption: Mentioning how every time students log in to their favorite website/social media or send a message, encryption is at work to keep their information safe.[br][br]3. Hazardous Situations in the Digital Environment: Talking about the importance of keeping passwords safe and not sharing them with strangers. Using analogies like:[br][list][*]“If you give your secret code to everyone, it’s no longer a secret.”[/*][*]“Always use a ‘lock’ (strong password) to keep your messages safe.”[/*][/list]

[b]Objective:[/b] Students will solve simple math division problems to decode a message.[br][br][b]Materials:[/b] Worksheet with math problems, Caesar cipher key with shift of three (provided on the worksheet).[br][br][list][*][justify]Next to each math problem on the worksheet, there is a blank space for the answer. Students should write the result of division, and then they should provide an encoded letter based on the Caesar cipher (i.e., if the result is 18 (4,609 ÷ 256 = 18), they look for a letter on the Caesar cipher which is in the 18th place, use a shift of 3, and find the correct letter). When they solve all math problems, they will reveal a hidden message (i.e., “Math is cool.”)[/justify][br][br]This activity reinforces basic arithmetic skills while also applying the Caesar cipher in a new context.[/*][/list]

[b]Objective: [/b]Combine ciphering, basic arithmetic, and physical movement in a team relay race.[br][br][b]Materials:[/b] Pre-written encrypted messages, math problem cards, cones, or markers to set up a relay path.[br][br][b]Setup:[/b][br][br]1. Dividing students into teams of 4–5 members.[br][br]2. Setting up a relay path in the gym (or outdoor area). At the starting point, each team receives a simple encrypted message (e.g., “YNCAU”).[br][br]3. Placing five different math problem cards at intervals along the path (e.g., “What is 30,000÷10,000?”, “What is 1,200 ÷ 300?”). Each math problem answer is a shift key for the letters of the encrypted message. When solving math problems in turn and using the obtained shift key (the result of the math task), students find a corresponding letter based on a Caesar cipher shift.[br][br][b]Instructions for students[/b]:[br][br]1. One student from each team runs to the first math card, solves the problem, and uses the shift key (result of the math problem) and Caesar cipher to decode the corresponding letter (first task – first letter of encrypted message, etc).[br][br][br]2. They run back and share the letter with their team, who start forming the decoded message.[br][br]3. The next student then runs to the next math card and repeats the process until all parts of the message are decoded.[br][br]4. The first team to decode the entire message correctly wins.[br][br]Example Message:[br]Cipher: “YNCAU”[br]Answer (Caesar shift of 3, 4, 2, 5, and 6, respectively): “BRAVO.”[br][br]This activity incorporates physical movement, teamwork, and math skills.

[b]Objective: [/b]Students will design and build a simple cipher wheel using craft materials. This activity will help them understand the mechanics behind shifting letters in ciphers, like the Caesar cipher, and develop basic engineering skills.[br][br][b]Materials Needed:[/b][br][list][*]Cardboard or thick paper[/*][*]Scissors[/*][*]Brass fasteners or push pins[/*][*]Markers[/*][*]Ruler and compass[/*][*]Alphabet templates[/*][/list]

Explain to the students that a cipher wheel is a tool that helps encode and decode messages by shifting the alphabet. Showing them a visual example of a basic cipher wheel.[justify][br]Students will draw two concentric circles on the cardboard: a larger one (around 10-12 cm in diameter) and a smaller one (6-8 cm in diameter). They will cut out the circles and place the smaller circle on top of the larger one. They will secure them at the center using a brass fastener so that the smaller circle can rotate freely. After that, they will write the alphabet around the edge of both circles (the outer circle will have the regular alphabet, while the inner circle will have a shifted alphabet). By rotating the inner circle, they will encode or decode a message using the chosen shift value. For additional complexity, students can add numbers or symbols to the wheel, representing different coding systems.[br][br]After building the cipher wheel, students can be given a set of encrypted science-related terms. They must decode the terms using their wheels. This activity will reinforce the students' understanding of how ciphers work while incorporating basic engineering concepts like measurement, alignment, and manual construction.[/justify]

[justify]This activity requires minimal preparation and simple equipment: balloons, adhesive tape, a marker, small paper notes, balls, and a wall. Before the game begins, prepare short tasks or challenges written or drawn on small notes (e.g., 10 squats, 5 push-ups, 20 jumping jacks, color codes, Morse code, or hidden messages). Place one note inside each balloon, inflate it, and tape the balloons securely to the wall. Divide the students into teams of two or more players; ideally, each team should consist of three to five students. Assign each team a specific balloon color (for example, red, blue, or white). Mark two lines in the playing area: the first line should be a few meters from the wall with the balloons, and the second line should be placed 10–15 meters behind the first.[/justify][justify]The goal of the game is for teams to throw a ball from behind the lines to burst their assigned balloons. Once a balloon is popped, the team completes the physical task written inside or works together to decode the hidden message. The first team to successfully complete all tasks or solve the final code wins the game.[/justify]

[b]Purpose: [br][br][/b]To strengthen students’ skills in [b]pattern recognition, logical reasoning, memory, and teamwork[/b]—all foundational to cracking codes and decoding messages.[br][br][b]Materials:[/b][list][*]Poly spots (or markers) laid out as a maze grid[/*][/list][list][*]Signs placed [b]under each spot[/b]:[/*][list][*]Some say [b]“OK/Safe.”[/b][/*][*]Others contain [b]challenges[/b] (simple movements) or [b]penalty markers[/b][/*][/list][/list][list][*]Cones or markers outlining the maze area[/*][/list]

[b]Game Setup[/b][br][list=1][*]Arrange Poly spots on the floor to create a network of paths (the maze).[/*][*]Under each Poly spot, place a small sign:[/*][list][*][b]Safe indicator (OK)[/b][/*][*][b]Challenge instruction[/b] (e.g., 5 jumping jacks, decode a small clue)[/*][*]Optional: [b]coded hints[/b] (simple letter or arithmetic hints) relating to your cipher lesson[/*][/list][*]Teams line up outside the maze.[/*][/list]

[b]How It Works[/b][br][list=1][*]Students take turns stepping onto one Poly spot at a time.[/*][*]When a student steps on a spot, they lift it and reveal the sign.[list][*]If it’s [b]OK[/b], the student stays, and the team can proceed.[/*][*]If it’s a [b]challenge[/b], the student completes it, notes the clue, and returns.[/*][/list][/*][*]Teams must [b]remember the safe path[/b] — revisiting a known unsafe path costs time or requires solving a small cipher.[/*][*]The goal is to [b]navigate through the maze using logic and memory[/b], not random guessing.[/*][/list]

[b]How This Relates to Cracking Codes[/b][list][*][b]Safe path = decrypted message[/b][br]The maze is a hidden code map. Just as students use keys to decode messages in other activities, here they must discover the “pattern of safety.”[/*][*][b]Memory + pattern recognition[/b][br]Like tracking letter shifts in a cipher wheel, students track which paths are beneficial and which are not.[/*][*][b]Data & strategy[/b][br]Keeping mental notes, adjusting strategy, and sharing information within the team are all part of decoding logic.[/*][/list]

After the game, guide students to reflect:[br][br][list][*] What helped you remember safe versus unsafe spots?[br][/*][*] How did your team share information about the maze?[br][/*][*] How was this similar to cracking a message code?[br][/*][*] Did you use any strategy to narrow down possibilities?[br][/*][*]How did decision-making change as you learned the maze?[br][/*][/list]

[list][*][b]Science -[/b] Hazardous Situations, Digital Safety.[/*][*][b]Technology –[/b] Understanding the importance of safety in a digital environment[/*][*][b]Engineering –[/b] Creating a cipher wheel[/*][*][b]Physical Education – [/b]Integrating movement into the code deciphering. [/*][*][b]Art - /[/b][/*][*][b]Mathematics[/b] – Reinforcing arithmetic skills (division of multi-digit numbers)[/*][/list]