BSidesDC 2015 CryptKids Crypto Challenge
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The document provides information about various codes and ciphers, including Morse code, Rail Fence cipher, Base64, Caesar cipher, semaphore, Playfair cipher, and the Cipher wheel. It then shares the solutions to the CryptKids crypto challenge, which used different ciphers at each step to reveal clues and solve puzzles. The challenges helped teach about cryptanalysis and different encryption methods.
BSidesDC 2015 CryptKids Crypto Challenge
- 1. Crypto 101 Afterword: This presentation was never actually delivered, however we had several of the CryptKids attendees throw themselves at the challenge with amazing energy, the kids Young Adults who won this years challenge were amazing. Next year the challenge will be split into three challenges for different age ranges.
- 2. Code or Cipher Codes are a way of translating language that does not involve hiding the meaning of the original message usually for digital transmission or brevity Examples: Morse code: a binary digital code for radio transmission Commercial code: special words used to replace entire phrases to save on transmission costs Brevity codes: used by militaries for radio transmission Base64: used for digital transmission on computer networks
- 3. Ciphers are ways of hiding communications so that only others who have the key can read them Examples Alberti Cipher (cipher disk) Cesar Cipher Enigma Code or Cipher
- 4. Every code or cipher has a key
- 5. Cryptanalysis The study of secret codes Frequency analysis Pattern analysis
- 7. Codes and ciphers in media Disney XD TV-Y Common sense media age recommendation 8+ Each episodes end credits has a different message Website dedicated to the secrets and codes themysteryofgravityfalls.com
- 9. AMC TV-14 Common sense media age recommendation 15+ There are episodes that discuss secret messages and different ways of hiding messages. Addresses espionage in historical context Codes and ciphers in media
- 10. Codes and ciphers in media PG-13 Common sense media age recommendation 13+ Dramatically 鍖ctionalized history of Alan Turing and the breaking of the Enigma
- 11. Codes and ciphers in media R Common sense media age recommendation 16+ Addresses issues with cryptanalysis and how adding a single wheel to the Enigma increase work factor required to solve it.
- 12. Codes and ciphers in media R Common sense media age recommendation 16+ Fictionalized history of Navajo Code Talkers
- 13. The CryptKids crypto challenge The next few slides will go through the clues from the challenge. Each decoded message would give you a clue to how to solve the next message
- 14. Welcome to the BSidesDC Cryptkids Crypto challenge. Each puzzle you 鍖nd will provide you with clues to solve other puzzles so it will be helpful to solve them in order. For the 鍖rst puzzle Ill give you the clue below to help you get started: Clue: If you had a radio and key you could easily unlock this code 1011 111 001 010 / 10 0 1001 1 / 1010 0100 001 0 / 00 000 111000 / 100 111 10 / 1 / 000 00 1 / 01 10 100 / 011 01 1 1010 0000 / 0010 010 111 11 / 1 0000 0 / 0010 0 10 1010 0 110011 / 110 0 1 / 00 10 / 1 0000 0 / 110 01 11 0 / 01 10 100 / 0000 01 0001 0 / 000 111 11 0 / 0010 001 10
- 15. Aemaaectarediir 1 rnha n mtu rporpe rae hscpe n10Fcndaryghctt hi9
- 16. Cpo qdaq Anms tva twfpbw vs iu!!!!!!!!n8
- 18. Hi orsh syv fsgiw brg fmtlivw cyx hlbx'w b "wiqb" jsv? B "cyrxmrk-xswwiv" gsiwr'x "xsww xli cyrxmrk" bra qsvi! =
- 20. mvnabpm fpb goyqycbma am ywifq bma ykykbtndwv xkgh sllf ynbll yzm dob dsvc ys mqhzf pkb dlmbk tvutskP
- 21. 13-1-18-25 13-1-18-25 17-21-9-20-5 3-15-14-20-18-1-18-25 25-15-21 19-8-15-21-12-4 8-1-22-5 21-19-5-4 2-5-20-20-5-18 3-15-4-5-19
- 23. Since you dont have access to the wheel I created for the conference use http://www.dcode.fr/alberti-cipher Set wheels to ABCDEFGHIJKLMNOPQRSTUVWXYZ1234 abcdefghijklmnopqrstuvwxyz1234 2RXKF1JHVTWSN3NMASPMBVQRDSRRELCG42WHXIPGMHZAZGG4KDB
- 24. Puzzle Solutions The next slides have the solutions and the ciphers used
- 25. 1) Morse Code: Dont sit and watch from the fence, get in the game and have some fun 2) Rail Fence: A Frenchman and amateur cryptographer created this cipher in 1901 3) bi鍖d: All your Base are belong to us!!!!!!!!x8 4) Base64: You wont need to shave this FOUR letter word to 鍖nd the next message but you might need to use it to 鍖nd the key 5) Cesar Keyed: Key - head Shift - 4 We know our codes and ciphers but what's a "sema" for? A "bunting-tosser" doesn't "toss the bunting" any more! 6) Semaphore: Youre half way there Have you been playing fair in the CRYPT kids challenge 7) Playfair: numbers are important to codes and ciphers you will need three two and four to solve the 鍖nal puzzle 8) Numbers: Mary Mary quite contrary You should have used better codes 9) Mary Queen of Scots: spin around 10) Cipher wheel:you have completed the bsidesdc cryptkids crypto challenge