Sharky's Vigenere Cipher This page is for amusement only. Instructions are given below this form. instructions: Enter the string to encrypt or decrypt in the Input field (you may copy and paste it from another text editor). Enter the key in the Key field. (You may use any sequence of characters, but only alphabetic characters will actually be processed. On most computers: To copy: Highlight text, press Ctrl-C; To paste: Position cursor, press Ctrl-V. explanation: Vigenere coding is one of the most ancient forms of cryptography. Choose a key that is as long as the plaintext message. Unfortunately, these steps take all the fun out of the Vigenere cipher. Vigenere ciphers with moderate keys are appropriate for situations that do not require failproof security. We hope you enjoy this simple JavaScript-based implementation.
Alan Turing Scrapbook - The Enigma War Alan Turing and the Battle of the Atlantic The Bombe was used with success from the summer of 1940 onwards, to break messages enciphered on the simpler Enigma system used by the German Air Force. But the most important messages were those to and from the U-boat fleet, and these were enciphered on a much more secure Enigma system. Alan Turing took on this problem, going against the prevailing view that it would prove unbreakable. See the October 1940 Operation Ruthless plan devised by Ian Fleming, later the creator of 'James Bond', to capture such information for Turing's work. The breakthrough came in February 1941, with the capture of papers from the Krebs off Norway. From then on, with the help of some further captures, the U-boat communications were effectively mastered. The naval Enigma was more complicated than those of the other German services, using a stock of eight rather than five rotors. See Steve Hosgood's page on 'Banburismus' for a detailed description of the whole process.
GC1M2NP A Lesson in Ciphers # 1 (Unknown Cache) in Missouri, United States created by TripCyclone This cache series is designed to give you an introduction to the world of ciphers. It will not cover every type of cipher out there, instead focusing on a small variety of different ciphers. Hopefully, you will walk away from solving this series with a new set of puzzle solving skills. I have designed this series such that you will not be able to solve them all in one swipe. Cryptography is defined as the practice and study of hiding information. For your first lesson, we'll use a cipher that I am certain ALL OF YOU have used already. abeguguveglrvtugqrterrfsvsglsbhecbvaggjbbarguerr jrfgavarglsbheqrterrfguveglguerrcbvagmrebsviravar You are looking for a small lock 'n lock container.
National Cryptologic Museum The National Cryptologic Museum is the National Security Agency's principal gateway to the public. It shares the Nation's, as well as NSA's, cryptologic legacy and place in world history. Located adjacent to NSA Headquarters, Ft. George G. Originally designed to house artifacts from the Agency and to give employees a place to reflect on past successes and failures, the Museum quickly developed into a priceless collection of the Nation's cryptologic history. Being the first and only public museum in the Intelligence Community, the Museum hosts approximately 50,000 visitors annually from all over the country and all over the world, allowing them a peek into the secret world of codemaking and codebreaking. The Museum is also an invaluable educational tool, benefiting thousands of students and teachers every year. The Museum has been featured in a plethora of international TV, print, and radio media and has hosted visitors and dignitaries from around the world.
MP3Stego When looking at the steganographic tools available on the Net, it occurred to me that nothing had been done to hide information in MP3 files, that is sound tracks compressed using the MPEG Audio Layer III format. There is a growing interest world-wide in MP3 or indeed WMA files because they offer near-CD quality at compression ratio of 11 to 1 (128 kilobits per second). This gives a very good opportunity for information hiding. Although WMA has better quality in general, I did not have access to code and only an implementation for MP3 is provided as a proof of concept. MP3Stego will hide information in MP3 files during the compression process. The hiding process takes place at the heart of the Layer III encoding process namely in the inner_loop. We have discussed earlier the power of parity for information hiding.
Introduction to Cryptography Basic Principles Whenever we come across the term cryptography, the first thing and probably the only thing that comes to our mind is private communication through encryption. There is more to cryptography than just encryption. In this article, we will try to learn the basics of cryptography. The Basic Principles 1. In a simplest form, encryption is to convert the data in some unreadable form. 2. This is another important principle of cryptography. 3. Now, one problem that a communication system can face is the loss of integrity of messages being sent from sender to receiver. 4. What happens if Alice sends a message to Bob but denies that she has actually sent the message? Types of Cryptography There are three types of cryptography techniques : Secret key CryptographyPublic key cryptographyHash Functions 1. This type of cryptography technique uses just a single key. The biggest problem with this technique is the distribution of key as this algorithm makes use of single key for encryption or decryption. 2.
Cryptography When I wrote my first book, Fermat’s Last Theorem, I made a passing reference to the mathematics of cryptography. Although I did not know it at the time, this was the start of a major interest in the history and science of codes and code breaking, which has resulted in a 400-page book on the subject, an adaptation of the book for teenagers, a 5-part TV series, numerous talks and lectures, the purchase of an Enigma cipher machine and the development of an interactive crypto CD-ROM. In the Crypto Corner, you will find details about my book on cryptography (The Code Book), information about my TV series based on the book (The Science of Secrecy) and you can explore the Black Chamber, which is an interactive encryption and codebreaking section. You will also find a section about the Cipher Challenge, there are some cryptograms (coded messages) for you to try and crack, a free downloadable CD-ROM version of The Code Book, and a quick Q&A based on the questions I am most often asked.
Enigma Simulator This software is an exact simulation of the 3-rotor Wehrmacht (Heer and Luftwaffe) Enigma, the 3-rotor Kriegsmarine M3, also called Funkschlussel M, and the famous 4-rotor Kriegmarine M4 Enigma cipher machine, used during World War II from 1939 until 1945. The sim has a very authentic feeling with its hands-on approach: you can select between the three models, actually lift out and insert different rotors, adjust their ring setting and set up the plugboard. The internal wiring of all rotors is identical to those that were used by the Wehrmacht and Kriegsmarine. This simulator is therefore fully compatible with the various real Enigma models and you can decrypt authentic wartime messages or encrypt and decrypt your own messages. The program comes with a very complete 22 page helpfile, containing the manual, some original messages, the history of Enigma and all technical details of the machine. Check out the Enigma Sim Manual to discover all the nuts and bolts of the software. Screenshots
Keyed Caesar One variation to the standard Caesar cipher is when the alphabet is "keyed" by using a word. In the traditional variety, one could write the alphabet on two strips and just match up the strips after sliding the bottom strip to the left or right. To encode, you would find a letter in the top row and substitute it for the letter in the bottom row. For a keyed version, one would not use a standard alphabet, but would first write a word (omitting duplicated letters) and then write the remaining letters of the alphabet. For the example below, I used a key of "rumkin.com" and you will see that the period is removed because it is not a letter. This encoder will let you specify the key word that is used at the beginning of the alphabet and will also let you shift the keyed alphabet around, just like a normal Caesar cipher. This is your encoded or decoded text:
Enigma (machine) Un article de Wikipédia, l'encyclopédie libre. Pour les articles homonymes, voir Enigma. Logo Enigma, une machine de chiffrement électromécanique à cylindres ; la version ci-dessus est un modèle militaire suisse, avec une console de lecture supplémentaire Tableau de permutations Machine Enigma modèle 1940. Enigma fut commercialisée en Europe et dans le reste du monde dès le début des années 1920. Son utilisation la plus célèbre fut celle de l'Allemagne nazie et de ses alliés, avant et pendant la Seconde Guerre mondiale, où elle était réputée inviolable par ses utilisateurs. Enigma chiffre les informations en faisant passer un courant électrique à travers une série de composants. Le clavier d'Enigma, capot fermé (gauche) et ouvert (droite), révélant les rotors et le compartiment de la batterie. Enigma est une machine électromécanique, ce qui signifie qu'elle utilise une combinaison de parties mécaniques et électriques. Le livre contenant les codes de configurations initiales.
Home - www.simplesite.com/the_runes “For me the magic moment came on page 2 where the green picture could mean any of three things. I identified the picture almost at once but could not see in which of the three directions it might go. And I knew that I had to find out!” “This should come with a warning label on it. ...It's highly additive. “I took it to Rome with me and sought inspiration in the Forum.... ................. aaaagh, there's no escaping the clutches of the Runes!” “It took three pages before I was fully sold on this. “What I have enjoyed is the step-by-step developments of the first few pages leading into the greater challenges as you realise that there is more to each puzzle than you were first led to think - and the buzz of discovery when you realise how it actually works.” ”This is one of the most complex puzzles I have ever encountered. “I am proud to say that I have had my first Eureka moment when everything just slotted into place. “I’m totally intrigued with this puzzle.