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Topic: Trifid cipher

Related Topics

Straddling checkerboard

Running key cipher

ADFGVX cipher

Playfair cipher

Pigpen cipher

Tabula recta

Book cipher

Scytale

	Cipher - The real meaning from Timesharetalk wikipedia (Site not responding. Last check: 2007-10-03)
		Historical pen and paper ciphers used in the past are sometimes known as classical ciphers.
		Simple ciphers were replaced by polyalphabetic substitution ciphers which changed the substitution alphabet for every letter.
		Symmetric key ciphers can be distinguished into two types, depending on whether they work on blocks of symbols of fixed size (block ciphers), or on a continuous stream of symbols (stream ciphers).
	www.timesharetalk.co.uk /wiki.asp?k=Cipher (1145 words)

	Fred Cohen & Associates
		We begin with a classification scheme for ciphers given by Gary Knight [Knight78] in the first of a series of articles which posed ciphers to the reader, and after a given period of time demonstrated reader solutions along with explanations of how they solved the ciphers.
		The 'wheel cipher' was invented by Thomas Jefferson around 1795, and although he never did very much with it, a very similar system was still in use by the US navy only a few years ago.
		The rotor is thus a "progressive key polyalphabetic substitution cipher with a mixed alphabet and a period of 26".
	all.net /books/ip/Chap2-1.html (5872 words)

	Chapter 8 -- The Cipher Exchange
		The CE ciphers given in The Cryptogram are all solvable by pencil and paper methods, although computers and other mechanical aids are often used to assist.
		Cipher substitutes are found at the other corners of that rectangle, first in square 2, the second in square 4.
		The cipher equivalents are those letters forming the opposite corners of a rectangle determined by the pt pair.
	www.und.nodak.edu /org/crypto/crypto/.chap08.html (5798 words)

	Trifid cipher - Wikipedia, the free encyclopedia
		Thus the trifid was the first practical trigraphic substitution.
		In this way, each ciphertext character depends on three plaintext characters, so the trifid is a trigraphic cipher.
		Thus, in a sense, the trifid cipher can be thought to stand on the border between classical cryptography's ancient Polybius square, and the binary manipulations of the modern world.
	en.wikipedia.org /wiki/Trifid_cipher (639 words)

	Substitution cipher - Wikipedia, the free encyclopedia
		A monoalphabetic cipher uses fixed substitution over the entire message, whereas a polyalphabetic cipher uses a number of substitutions at different times in the message—such as with homophones, where a unit from the plaintext is mapped to one of several possibilities in the ciphertext.
		The cipher alphabet may be shifted or reversed (creating the Caesar and Atbash ciphers, respectively) or scrambled in a more complex fashion, in which case it is called a mixed alphabet or deranged alphabet.
		Modern stream ciphers can also be seen, from a sufficiently abstract perspective, to be a form of polyalphabetic cipher in which all the effort has gone into making the keystream as long and unpredictable as possible.
	en.wikipedia.org /wiki/Substitution_cipher (2600 words)

	Autokey cipher - Wikipedia, the free encyclopedia
		An autokey cipher is a cipher which incorporates the message (the plaintext) into the key.
		The first autokey cipher was invented by Girolamo Cardano, and, although it contained a weakness that made it easy to break, a number of attempts were made by other cryptographers to produce an autokey system that was not trivial to break; eventually one was invented by Blaise de Vigenère.
		Most modern stream ciphers are based on pseudorandom number generators: the key is used to initialize the generator, and either key bytes or plaintext bytes are fed back into the generator to produce more bytes.
	en.wikipedia.org /wiki/Autokey_cipher (737 words)

	Atbash - The real meaning from Timesharetalk wikipedia (Site not responding. Last check: 2007-10-03)
		It is a very weak cipher because it only has one possible key, and it is a simple monoalphabetic substitution cipher.
		The Atbash cipher is referenced in Google's Da Vinci Code Quest, in which participants must decode a common word from Atbash.
		A secret message is set to use the atbash cipher at this point in reading the document.
	www.timesharetalk.co.uk /wiki.asp?k=Atbash (290 words)

	Playfair cipher - Wikipedia, the free encyclopedia
		The Playfair cipher or Playfair square is a manual symmetric encryption technique and was the first literal digraph substitution cipher.
		When only the ciphertext is known, brute force cryptanalysis of the cipher involves searching through the key space for matches between the frequency of occurrence of digrams (pairs of letters) and the known frequency of occurrence of digrams in the assumed language of the original message.
		The cipher lends itself well to crossword puzzles, because the plaintext is found by solving one set of clues, while the ciphertext is found by solving others.
	en.wikipedia.org /wiki/Playfair_cipher (1524 words)

	The Bifid, the Trifid, and the Straddling Checkerboard (Site not responding. Last check: 2007-10-03)
		This is the Bifid cipher of Delastelle, and the general principle of this form of cipher is called seriation.
		This is one of the most secure pencil-and-paper ciphers that is still used by hobbyists as a puzzle.
		The Trifid, also due to Delastelle, is the analogous cipher using a 27-letter alphabet represented by three symbols from 1 to 3:
	www.quadibloc.com /crypto/pp1322.htm (1187 words)

	[3.0] The Rise Of Field Ciphers
		It was known as the "le chiffre indechiffrable (the indecipherable cipher)".
		Given that the standard Vigenere cipher was based on a Ceasar shift, Holmes could easily figure out the shift by observing a Pareto chart of the frequency distribution of the set and comparing it to a Pareto chart of the frequency distribution of average English text.
		One significant change was that the eight single-digit cipher letters were assigned to the eight most common plaintext letters, improving the efficiency of the cipher, as well as helping to conceal the first digits of the two-digit cipher letters by reducing their frequency.
	www.vectorsite.net /ttcode_03.html (7748 words)

	Bletchley Park Cryptographic Dictionary (Site not responding. Last check: 2007-10-03)
		Performed, produced, or obtained by means of the (hollerith) electrical calculating, sorting, collating, reproducing, and tabulating machines in Mr.
		To list, arrange, analyse, or otherwise deal with cipher material by means of (Hollerith) electrical machines to aid cryptographic investigation.
		Diagram or record showing relative frequencies, especially of individual letters of the alphabet in a representative text of a particular language, or of the individual letters or other symbols of a particular cipher.
	www.codesandciphers.org.uk /documents/cryptdict/page39.htm (215 words)

	[No title] (Site not responding. Last check: 2007-10-03)
		All of the cipher types present in this package are best described in the Handbook for Members of the American Cryptogram Association, "The ACA and You".
		Many of the cipher types also have programs or scripts that will solve them with little user intervention.
		I'm always adding new cipher types and improving on the programs' abilities to manipulate the existing ones.
	www.und.nodak.edu /org/crypto/crypto/solvers/wart/README.ciphertool (298 words)

	Lanaki Lesson 12
		The numbers associated with any given cipher letter represent a stretch of 10 consecutive values along a normal alphabet such as C to L or X to G, we could prepare a table with A to Z as the rows and 9 to 0 as the columns.
		This conversion is possible because the sequence of letters forming the cipher component has been reconstructed and was known, and the uniliteral distributions for the respective secondary cipher alphabets could theoretically be shifted to correct superimpositions for monoalphabeticity.
		In summary, we have seen that the chaining process between cipher texts applies to the latent characteristics of the cipher components, regardless of the identity of the plain components and regardless whether direct or indirect symmetry is involved in the cryptosystems.
	www.fortunecity.com /skyscraper/coding/379/lesson12.htm (15289 words)

	sci.crypt: Re: Trifid + Vigenere + Trifid (was: Which paper and pencil cipher to use?)
		Re: Trifid + Vigenere + Trifid (was: Which paper and pencil cipher to use?)
		In reply to: Markus Jansson: "Re: Trifid + Vigenere + Trifid (was: Which paper and pencil cipher to use?)"
		The Trifid is a similar block cipher that suffers the same
	www.derkeiler.com /Newsgroups/sci.crypt/2003-02/0777.html (567 words)

	Lanaki Lesson 11
		Since cipher letter G is involved, we place the G under the I which results in the Y we already had and putting G under the U gives us M under the A, we choose the latter.
		Using the previous example, we let the first ten cipher letters in each alphabet be set down in a horizontal line and the assumption is made that the alphabets are direct standard with normal sequences.
		If reversed standard alphabets are used, we must convert the cipher letters of each isolated alphabet into their normal, plain component equivalents, and then proceed as in the case of direct standard alphabets.
	www.fortunecity.com /skyscraper/coding/379/lesson11.htm (14453 words)

	BibTeX bibliography cryptography.bib (Site not responding. Last check: 2007-10-03)
		Francof., anno 1606.", acknowledgement = ack-nhfb, annote = "The Trithemius ciphers were finally solved in 1998 by J. Reeds \cite{Reeds:1998:SCB}.", } @Book{Trithemius:1606:CSI, author = "Johannes Trithemius", title = "Clauis {Steganographiae Ioannis Trithemij}, abbatis {Spanheimensis}, ad Serenissimum Principem Dn.
		Francof., anno 1621.", acknowledgement = ack-nhfb, annote = "The Trithemius ciphers were finally solved in 1998 by J. Reeds \cite{Reeds:1998:SCB}.", } @Book{Trithemius:1621:CSI, author = "Johannes Trithemius", title = "Clauis Steganographiae {Ioannis Trithemij}, abbatis Spanheimensis, ad Serenissimum Principem Dn.
		It is a revision of an earlier paper with the same title published in 1922 by the Riverbank Laboratories, Geneva, Ill.", keywords = "Ciphers; Cryptography.", } @Book{Friedman:1935:MCP, author = "William F. (William Frederick) Friedman", title = "Military cryptanalysis.
	www.math.utah.edu:8080 /ftp/pub/tex/bib/cryptography.html (1310 words)

	[No title]
		Ciphers and cryptanalytic techniques for solution are presented.
		Volume II covers polyalphabetic substitutions ciphers in the Vigenere family (Viggy, Variant, Beaufort, Porta, Gronsfeld, Portax, Gromark), decimation, principles of symmetry, isologs and superimposition solution techniques.
		Volume II describes the difficult aperiodic cipher systems (Interrupted key, Autoclave, Progressive, Running Key used in cipher machines) and their analysis by isomorphs, and repetitions.
	www.math.utoledo.edu /~codentha/Cryptanalysis/lanaki/lanaki.ref.txt (15937 words)

	American Cryptogram Association - Resources
		Here you will find the fruits of several hundred years of development of cryptography, as cryptanalysts discovered new ways to attack a cipher, and the encipherers then complicated the ciphers to compensate.
		Some of the ACA systems were used historically in precisely the form we use; some are simplified to highlight unique aspects of that cipher type; and some were invented by ACA members.
		The ciphers are printed in approximate order of difficulty (as determined by experience) in The Cryptogram.
	www.cryptogram.org /cipher_types.html (222 words)

	Paper & Pencil Cryptography
		It is somehow safe cipher as it causes the fractionation of every letter to 2 or more fractions.
		This codes are saved by the spy in a book, always it is very small(can be hidden inside a concealment coin!!) to ease its concealment and the codes are well organized alphabetically for rapid coding and decoding.
		The presence of an original script of a ciphered messages or codes is of great importance to the code breakers in cryptanalysis, so they have to reform the message in other words,for this reason that the secret services always try to steal the cipher and code books.
	www.angelfire.com /clone2/darkcorner/cipherscodes.html (2146 words)

	Vadium Technology
		A study of the Aristocrat that concentrates on identifying consonants and vowels.
		It is a study of how attacks on breakable cipher systems are mounted.
		This book is part of the New Mathematical Library series and is a well-written description of several ciphers.
	www.vadiumtech.com /resources/reference.htm (760 words)

	Third phone numbers station: 678-248-2352 - Homeland Stupidity
		Also I do have the feeling that if this cipher or a cipher like it should be used you should first do something with the group code to change the numbers in the message.
		Playfair is a digraph cipher, invented in 1854 by Sir Charles Wheatstone.
		The Vigenère cipher, invented by Giovanni Batista Belaso, is a poly- alphabetic substitution cipher.
	www.homelandstupidity.us /2006/06/10/third-phone-numbers-station-678-248-2352 (9961 words)

	Delastelle's Fractional Substitution (Site not responding. Last check: 2007-10-03)
		At first, the text is encoded using a checkerboard cipher.
		This cipher is quite similar to the Bifid cipher described above.
		see which ciphers are available within CipherClerk's Applet.
	members.aon.at /cipherclerk/Doc/DelastelleFract.html (155 words)

	Braingle: Codes, Ciphers, Encryption and Cryptography
		Cryptography is the discipline of using codes and ciphers to encrypt a message and make it unreadable unless the recipient knows the secret to decrypt it.
		Encryption has been used for many thousands of years.
		The following codes and ciphers can be learned and used to encrypt and decrypt messages by hand.
	www.braingle.com /brainteasers/codes/index.php (52 words)

	Braingle: Version Information
		Trifid Cipher added to codes and ciphers section
		Addition of several new codes to the Codes and Ciphers section.
		Added Codes and Ciphers to the brain teasers section.
	www.braingle.com /version.php (638 words)

	Cryptography > Welcome : Meso Gunus Web Guides (Site not responding. Last check: 2007-10-03)
		And irrespective of whether they do the crypto properly, the computers on the receiving end...
		6.) Book on ciphers is far from clueless - Courier Mail
		Wednesday 31st of December 1969 04:00:00 PM Book on ciphers is far from clueless
	cryptography.mesogunus.com (636 words)

	Cryptography
		(trial key) Cipher: T I Q E W X Q T O J I V........
		The Vigenere Cipher works equally well in reverse.
		We make uniliteral frequency distributions for the 5 alphabets to determine if we have standard alphabets.
	www.threaded.com /cryptography11.htm (14428 words)

	CipherClerk's List Of Ciphers (Site not responding. Last check: 2007-10-03)
		Doppelkastenschlüssel - "Double box key", a german WWII field cipher.
		Japanese Angooki Taipu A - The 'RED' Machine
		Actually, not really a cipher - but usefull anyway!
	members.aon.at /cipherclerk/Doc/CipherList.html (57 words)

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