Coding and Deciphering_Communications

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A brief introduction to Coding and Decoding

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Coding and Deciphering_Communications

  1. 1. The1st Kuala Lumpur Boys’ Brigade CompanyCommunications 21th July 2012 1
  2. 2. The Process ofCOMMUNICATION Noise Encoding Message Decoding Sender Receiver Message Channel Message Message Channel 1st KL Communication Class - Advance 2
  3. 3. THE ENCODING … is a system every word or phrase in your message is replaced by another word, phrase, or series of symbols A cipher is a system where every letter of your message is replaced by another letter or symbol 1st KL Communication Class - Advance 3
  4. 4. The Encoding Secret code and ciphers are also involved in serious situations like in wars. People will want to break codes and ciphers to find out what the message is. 1st KL Communication Class - Advance 4
  5. 5. CONTENT 1.0 Codes 2.0 Word Clue Code 3.0 Ciphers 1.1 Book Code 3.1 Caesar Cipher 1.2 Dictionary Code 1.3 Pig Latin 1.4 Turkish Irish 4.0 St. Cyr. Slide 5.0 Concealment 4.1 Keyboard Cipher 5.1 Space Code 4.2 Date Shift Cipher 4.3 Combining Ciphers 1st KL Communication Class - Advance 5
  6. 6. 1.1(2) CODES – Book/ Dictionary Code 1 Get 2 books that are the exact same thing. They must be the exact same, the same copyright date, the same words, letters, language, everything, or else it will ruin this code. Now, hand a copy of the book to your partner and you will use the other one. (Dictionaries work best). 1st KL Communication Class - Advance 6
  7. 7. 1.1(2) CODES – Book/ Dictionary Code 2 Coding the Word For example, you want to say "These pictures were in a book." well, you will have to search for these words in the book. Say like the word "These" is on page 212. Well, the first 3 digits of your code is 212. Then, you find the row of words. For example, the word "these" is in row 4 of the book you are using. So now your code is 21204. Notice how I put the 0 in front of the 4 to make it a 2-digit number. Now, say that "these" is the 7th word in the 4th row on page 212. Your code will be 2120407. Using this code, every code should have 5, 6, or 7 digits (depending on if the book has 1000 pages or more; 9 or less rows; or 9 or less words in each row). 1st KL Communication Class - Advance 7
  8. 8. 1.1(2) CODES – Book/ Dictionary Code 3 Test it out with a partner. Once you learn this simple but effective code, it will be really hard for an enemy to break it. 1st KL Communication Class - Advance 8
  9. 9. 1.3 CODES – Pig Latin 1 Identify words that begin with a vowel (vowels vary within language to language). If it does, simply add "ay" to the end of the word. For example, ear becomes earay, arch becomes archay, and insulation becomes insulationay. 2 Identify the words that begin with a consonant. If it does, move the first letter of the word to the end and add "ay." If the initial consonant sound is made up of two letters, like TH and CH, you move both to the end and add "ay." For example, trunk becomes unktray, glasses becomes assesglay measles becomes easlesmay 1st KL Communication Class - Advance 9
  10. 10. 1.4 CODES – Turkish Irish 1 Simply put ab before the first vowel of a word. Again, just like Pig Latin, this code works best when spoken. Identify the words that begin with a consonant. For example feet becomes fabeet grudge becomes grabudge Brigade becomes Brabigade 1st KL Communication Class - Advance 10
  11. 11. 2.0 WORD CLUE This code is simple (yet easy to break). Certain words are instructions, like meet me at the book mixed-up hops, which means meet me at the book shop because hops scrambled is shop. You could do reversed, making a word spelled backwards; scrambled or mixed-up, meaning to anagram it; or sounds like meaning the word sounds like it. Unless you are using a sandbox, this code is too easy to use to fool people, and complex variations will have to be used in order to counter this problem. You also need to prove that this zzbz sgssbs xhsa (code) will be understand 1st KL Communication Class - Advance 11
  12. 12. 3.0 CIPHERS Understand what a cipher really is. What kind of cipher do you want to use? There are only two (2) types of ciphers you could use: Transposition & Substitution. Both have their advantages and disadvantages. • Substitution ciphers are easier to break, but transposition ciphers are not as easy to use. A substitution cipher is that you substitute one letter and replace it with another letter or symbol. • Transposition cipher is where you transpose or rearrange the position of the letters. 1st KL Communication Class - Advance 12
  13. 13. 3.1 Caesar Cipher The Caesar Cipher shifts the alphabet 3 places. A becomes X B becomes Y C becomes Z, and so on. So if you were to write “Meeting tomorrow at station," you would write it as “Jbbqfkd qljloolt xq pqxqflk.” 1st KL Communication Class - Advance 13
  14. 14. 3.1 Caesar Cipher Come for band practice tomorrow! ABCDEFGHIGJKLMNOPQRSTUVWXYZ Zljb clo yxka moxzqfzb qljloolt! 1st KL Communication Class - Advance 14
  15. 15. 4.0 St. Cyr. Slide The St. Cyr. you were able to shift the alphabet as many places as you wish. You can shift the alphabet so that A becomes K, B becomes L, and so on. Or you could say that A becomes B, B becomes C, and so on. 1st KL Communication Class - Advance 15
  16. 16. 4.1 KEYBOARD CIPHER Get a keyboard, and make sure that it has all 26 letters of the alphabet. You will need a QWERTY type because keyboards from different countries will have different letters. You can shift the keyboard to one letter space to the left, so on your keyboard, H becomes G, F becomes D, and A becomes L ("turn over to the other side"). 1st KL Communication Class - Advance 16
  17. 17. 4.1 KEYBOARD CIPHER Call me as soon as possible Xlkk nw la aiin la oiaauvkw 1st KL Communication Class - Advance 17
  18. 18. 4.1 KEYBOARD CIPHER 1st KL Communication Class - Advance 18
  19. 19. 4.2 DATE CIPHER 1 Identify a Date Steven Spielbergs birthday: December 18, 1946 2 Abbreviate the Date Change the date to MM/DD/YY – 121846 3 Decode Message using date Assume the message is I enjoy the movies of Steven Spielberg 1 21846 121 846121 84 612184 612184612 4 Shifting the Letters Shift each letter of the plain text by the number of spaces indicated by the number below it. The letter I shifts one space, making it J; E shifts 2 spaces, making it G. Your final message would be: J gorse ujf usbjgt wj yugwmr yqkftfksi. 1st KL Communication Class - Advance 19
  20. 20. 4.3 COMBINE CIPHER You can also apply several ciphers to each other, thus creating a stacked cipher. 1st KL Communication Class - Advance 20
  21. 21. 5.0 CONCEALMENT Codes and ciphers DO NOT conceal messages; they REPLACE it. Concealment is different because the message can be revealed, but is hidden. Concealment works much better if a string of words make sense with each other, making a legitimate sentence. Doing this will fool people much longer than nonsense words. 1st KL Communication Class - Advance 21
  22. 22. 5.1 Space Code A space code is moving the space to another place in a message. For Example the message "I am your friend" could be Ia myou rfr iend. Again, this is a code where you will have to speak it to conceal it. If you write it down, a person could easily find out the message by looking at it from a relatively long distance from the paper. 1st KL Communication Class - Advance 22
  23. 23. 5.1 Space Code I h o p e y o u h a ve e n j o y e d t h i s l e s s o nt h a n k y o u I h o p e y o u h a v e e n j oy e d this lesson thank you 1st KL Communication Class - Advance 23
  24. 24. The End1st KL Communication Class - Advance 24

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