The Playfair Cipher

The Playfair cipher was invented by Sir Charles Wheatstone and popularized by Baron Lyon Playfair. It is relatively easy to learn and to use with only pencil and paper. It was used during combat in WWII for messages who’s relevance was short lived. I enjoy this cipher mainly because traditionally it’s written down in pairs … [Read more…]

Defcon 21 Badge Challenge Walkthrough Part 3

Floor Puzzles =================== Clock Face ————— The symbols are Rod Numerals ( https://en.wikipedia.org/wiki/Counting_rods#Rod_numerals ) turned sideways every other digit. When converted to letters reads: defcon, 21,¬†keyword, orrery which leads to: https://www.defcon.org/1o57/dc21/orrery Skull Puzzle —————— The symbols on the skull puzzle are actually from another “Chain of Death” cipher from The Shadow http://www.nku.edu/~christensen/section%205%20symbols.pdf You read it … [Read more…]

Defcon 21 Badge Challenge Walkthrough Part 2

Posters: ================= There are 7 posters with cipher text. 4 labeled with numbers that when converted from dec to ascii are labeled J, A, C, and K, and three with key holes. Numbered Posters ———————– – 74 “J” (Social Engineering Village): VEVMRUBLFDZMGGLYVORVEV LMVLUGSVQZXPHWLVHMGYVO (can be decoded with atbash) => EVENIFYOUWANTTOBELIEVE ONEOFTHEJACKSDOESNTBEL – 65 “A” (Wireless … [Read more…]

The Science of Secrecy: Introduction and Future of Cryptography

From the description: Join Imperial’s Institute for Security Science and Technology for an informative presentation on codes, ciphers and computers. Professor Richard Aldrich, Dr Martin Knight, Professor Sir Peter Knight and Dr Simon Singh take you on a tour of cryptography through the ages. From its beginnings in pen and paper to its future in … [Read more…]