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Encryption and decryption method
A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key
Book_cipher
Simple and widely known encryption technique
A Caesar cipher is one of the simplest and most widely known encryption techniques used in cryptography. It is a type of substitution cipher in which
Caesar_cipher
System to replace plaintext with ciphertext
In cryptography, a substitution cipher is a method of encrypting that creates the ciphertext (its output) by replacing units of the plaintext (its input)
Substitution_cipher
Algorithm for encrypting and decrypting information
In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a
Cipher
Simple type of polyalphabetic encryption system
The Vigenère cipher (French pronunciation: [viʒnɛːʁ]) is a method of encrypting alphabetic text where each letter of the plaintext is encoded with a different
Vigenère_cipher
Puzzle
classical ciphers are sometimes used to create cryptograms. An example is the book cipher, where a book or article is used to encrypt a message. The ciphers used
Cryptogram
Type of polyalphabetic substitution cipher
cryptography, the running key cipher is a type of polyalphabetic substitution cipher in which a text, typically from a book, is used to provide a very long
Running_key_cipher
Set of three ciphertexts
The Beale ciphers are a set of three ciphertexts, one of which allegedly states the location of a buried treasure of gold, silver and jewels estimated
Beale_ciphers
Book by Simon Singh
The Code Book describes some illustrative highlights in the history of cryptography, drawn from both of its principal branches, codes and ciphers. Thus the
The_Code_Book
Type of substitution cipher
pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) is a geometric
Pigpen_cipher
Cryptography algorithm
In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide information security such as confidentiality or
Block cipher mode of operation
Block_cipher_mode_of_operation
Book cipher used by John André and Benedict Arnold
The Arnold Cipher was a book cipher used by John André and Benedict Arnold during the negotiations that led to Arnold's failed attempt to surrender West
Arnold_Cipher
Early block substitution cipher
The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution
Playfair_cipher
Book for ciphers
with 30,000 random additives. The book used in a book cipher or the book used in a running key cipher can be any book shared by sender and receiver and
Codebook
Multiple-substitution writing system cipher
polyalphabetic cipher is a substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though
Polyalphabetic_cipher
2024 novel by Alex Hirsch
by series creator Alex Hirsch, the book retells its story from the perspective of primary antagonist Bill Cipher (who is credited as a co-writer and
The_Book_of_Bill
Unbroken cipher
The D'Agapeyeff cipher is an unsolved cipher that appears in the first edition of Codes and Ciphers, an elementary book on cryptography published by the
D'Agapeyeff_cipher
American science fiction television series
Century Fox, which entered negotiations to acquire the self-published e-book Wool by Hugh Howey on May 11, 2012. Five days later, 20th Century Fox acquired
Silo_(TV_series)
colleagues, one of whom wrote, "He was a brilliant cryptographer. On book cipher and anything else where insight was vital he was quite the best. He was
Ernst_Fetterlein
2nd episode of the 1st series of Sherlock
them stole something. Sherlock knows the message is in the form of a book cipher, and he and John spend the night going through the first two victims'
The_Blind_Banker
2004 film by Jon Turteltaub
to Patrick's house, the trio studies the Declaration and discovers a book cipher written in invisible ink. The message refers to Benjamin Franklin's Silence
National_Treasure_(film)
Study of analyzing information systems in order to discover their hidden aspects
– via Google Books. Simon Singh, The Code Book, pp. 14–20 "Al-Kindi, Cryptgraphy, Codebreaking and Ciphers". Archived from the original on 5 February
Cryptanalysis
Disused cipher that was used historically
In cryptography, a classical cipher is a type of cipher that was used historically but, for the most part, has fallen into disuse. In contrast to modern
Classical_cipher
French cypher that remained unbroken for several centuries
The Great Cipher (French: Grand chiffre) was a nomenclator cipher developed by the Rossignols, several generations of whom served the French monarchs
Great_Cipher
Practice and study of secure communication techniques
(or "E") for the eavesdropping adversary. Since the development of rotor cipher machines in World War I and the advent of computers in World War II, cryptography
Cryptography
Algorithm
use either stream ciphers or block ciphers. Stream ciphers encrypt the digits (typically bytes), or letters (in substitution ciphers) of a message one
Symmetric-key_algorithm
Type of code
checkerboard – Cryptographic cipher device Tap code – Encoding for text messages Topics in cryptography "Polybius • Histories — Book 10". penelope.uchicago
Polybius_square
2017 book by Craig P. Bauer
Greatest Ciphers from Ancient Egypt to Online Secret Societies is a 2017 book by American mathematician and cryptologist Craig P. Bauer. The book explores
Unsolved!
German cipher machine during World War II
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication
Enigma_machine
Scavenger hunt based on Gravity Falls
The Cipher Hunt was an alternate reality game and international scavenger hunt created by storyboard artist and voice actor Alex Hirsch based on his animated
Cipher_Hunt
Cipher machines used by the German Army during World War II
The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II. They were developed by C. Lorenz
Lorenz_cipher
2025 British television series
escapes in a stolen boat. Iris deduces Lind used his own DNA sequence as a book cipher to encrypt the password. Enrico Bruni, the leader of the corrupt detectives
The_Iris_Affair
Steganography method
Bacon's cipher or the Baconian cipher is a method of steganographic message encoding devised by Francis Bacon in 1605. In steganography, a message is
Bacon's_cipher
Type of cipher used in World War I
In cryptography, the ADFGVX cipher was a manually applied field cipher used by the Imperial German Army during World War I. It was used to transmit messages
ADFGVX_cipher
Substitution cipher based on linear algebra
Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which
Hill_cipher
Historical article manuscript
The Copiale cipher is an encrypted manuscript created in the 1700s and consisting of 75,000 handwritten characters filling 105 pages in a bound volume
Copiale_cipher
Fundamental tool in cryptography
in 1508, and used in his Trithemius cipher. The Trithemius cipher was published by Johannes Trithemius in his book Polygraphia, which is credited with
Tabula_recta
Manually operated symmetric encryption cipher
In the history of cryptography, the Nihilist cipher is a manually operated symmetric encryption cipher, originally used by Russian Nihilists in the 1880s
Nihilist_cipher
Simple form of encryption
null cipher, also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material
Null_cipher
with the Caesar cipher, the Affine cipher, the Keyword cipher, the Transposition cipher, the Vigenère cipher and the 2x2 Hill cipher. The part B challenges
National_Cipher_Challenge
1989 illustrated children's book by Graeme Base
the end of the book, which is to be decrypted, once the reader has discovered the identity of the thief, by means of a Caesar cipher mapping A to the
The_Eleventh_Hour_(book)
Type of transposition cipher
The rail fence cipher (also called a zigzag cipher) is a classical type of transposition cipher. It derives its name from the manner in which encryption
Rail_fence_cipher
Episodes list for a TV series
Sherlock eventually cracks the coded message based on Suzhou numerals and a book cipher, but not before John and his date, Sarah, are kidnapped by the criminals
List_of_Sherlock_episodes
Book by William Gibson
benefit of future generations. Agrippa was also used as the key of a book cipher in the Cicada 3301 mystery. Agrippa was particularly well received by
Agrippa_(A_Book_of_the_Dead)
Encryption technique
ciphertext in order to be useful. Félix Delastelle described the cipher in his 1901 book Traité élémentaire de cryptographie under the name damiers bigrammatiques
Two-square_cipher
Class of cipher
In the history of cryptography, a grille cipher was a technique for encrypting a plaintext by writing it onto a sheet of paper through a pierced sheet
Grille_(cryptography)
Encryption and decryption tool consisting of two metal plates with alphabets
A cipher disk is an enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device
Cipher_disk
Musical algorithm for encrypting and decrypting information
cryptography, a music cipher is an algorithm for the encryption of a plaintext into musical symbols or sounds. Music-based ciphers are related to, but not
Music_cipher
Type of symmetric key cipher
stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream (keystream). In a stream cipher, each
Stream_cipher
American animator (born 1985)
Gravity Falls, and voiced its characters Grunkle Stan, Soos Ramirez, and Bill Cipher, among others. The show has won several BAFTA and Annie Awards. In 2016
Alex_Hirsch
Block cipher introduced in 1991
their Kindle e-book reader's DRM system. The PC1 cipher was designed by Alexander Pukall in 1991. Caracachs Cipher formerly known as PC3 Cipher was released
PC1_cipher
15th-century codex in an unknown script
script for a natural language or constructed language, an unreadable code, cipher, or other form of cryptography, or perhaps a hoax, reference work (i.e.
Voynich_manuscript
Canadian poet and artist
devised the longest acronym in the English language, Acronymic in his book Cipher and Poverty. The following are some books by Schertzer: The House of
Mike_Schertzer
Method of encryption
In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters (transposition)
Transposition_cipher
Enciphered text written by English composer Edward Elgar
The Dorabella Cipher is an enciphered text written by composer Edward Elgar to Dora Penny, which accompanied a plaintext letter dated July 14, 1897. Penny
Dorabella_Cipher
Encryption technique
the principles of information theory. Digital versions of one-time pad ciphers have been used by nations for critical diplomatic and military communication
One-time_pad
Encrypted information
result of encryption performed on plaintext using an algorithm, called a cipher. Ciphertext is also known as encrypted or encoded information because it
Ciphertext
Serial killer in California in the 1960s
the crimes and ciphers. Dozens of books and documentaries have focused on the Zodiac. The original and most influential amateur book was Robert Graysmith's
Zodiac_Killer
Simple encryption method
substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. It is a special case of the Caesar cipher which was developed
ROT13
Classic polyalphabet encryption system
An autokey cipher (also known as the autoclave cipher) is a cipher that incorporates the message (the plaintext) into the key. The key is generated from
Autokey_cipher
Complex Soviet pencil and paper cipher
The VIC cipher was a pencil and paper cipher used by the Soviet spy Reino Häyhänen, codenamed "VICTOR". If the cipher were to be given a modern technical
VIC_cipher
Cryptographic cipher
The Aristocrat Cipher is a type of monoalphabetic substitution cipher in which plaintext is replaced with ciphertext and encoded into assorted letters
Aristocrat_Cipher
Substitution cipher
(Hebrew: אתבש; also transliterated Atbaš) is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use
Atbash
meeting ends with the bible cipher missing, and Barrett dead. Jesse later agrees to work with Michael and recover the book cipher for them. Surprisingly,
List of Burn Notice characters
List_of_Burn_Notice_characters
Japanese manga series
Cipher Academy (Japanese: 暗号学園のいろは, Hepburn: Angō Gakuen no Iroha) is a Japanese manga series written by Nisio Isin and illustrated by Yūji Iwasaki. It
Cipher_Academy
Ciphers used by the Imperial Japanese Navy in World War II
The vulnerability of Japanese naval codes and ciphers was crucial to the conduct of the Pacific War of World War II, and had an important influence on
Japanese_naval_codes
Block cipher
In cryptography, the Tiny Encryption Algorithm (TEA) is a block cipher notable for its simplicity of description and implementation, typically a few lines
Tiny_Encryption_Algorithm
Polyalphabetic encryption system
The Beaufort cipher, created by Sir Francis Beaufort, is a substitution cipher similar to the Vigenère cipher, with a slightly modified enciphering mechanism
Beaufort_cipher
Cryptographic algorithm
considered incriminating. Furthermore, analysis has revealed flaws in the cipher such that it is now considered insecure. This algorithm uses a standard
Solitaire_(cipher)
Cryptanalytic method for unauthorized users to access data
guess the passcode of locked iPhones running iOS 10.3.3 How We Cracked the Code Book Ciphers – Essay by the winning team of the challenge in The Code Book
Brute-force_attack
Simple substitution cipher
Nyctography (in Nyctography: ) is a form of substitution cipher writing created by Lewis Carroll (Charles Lutwidge Dodgson) in 1891. It is written with
Nyctography
Encryption system
In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion
Bifid_cipher
American animated television series
Petrana (December 15, 2023). "Gravity Falls creator wrote a new Bill Cipher book for 'older readers'". Polygon. Retrieved December 15, 2023. Alex Hirsch
Gravity_Falls
Polyalphabetic substitution encryption and decryption system
The Alberti cipher, created in 1467 by Italian architect Leon Battista Alberti, was one of the first polyalphabetic ciphers. In the opening pages of his
Alberti_cipher
Fractionated cipher
trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. Extending the principles of Delastelle's earlier bifid cipher, it
Trifid_cipher
called the Atbash Cipher and was utilized to decrypt. The city "Sheshach" does not appear on any map nor in any other documents, save the book of Jeremiah.
Sheshach
Type of substitution cipher
The affine cipher is a type of monoalphabetic substitution cipher, where each letter in an alphabet is mapped to its numeric equivalent, encrypted using
Affine_cipher
British cipher machine
Typex (also spelled Type X or TypeX) was the primary cipher machine used by the British military during World War II by and into the early Cold War. Based
Typex
Encryption tool used to perform a transposition cipher
cylinder", also σκύταλον skútalon) is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it on which
Scytale
Decryption of World War II cipher
Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications
Cryptanalysis_of_the_Enigma
Comics character
Cipher (Alisa Tager) is a mutant superhero appearing in American comic books published by Marvel Comics. She is a young African-American woman who first
Cipher_(comics)
Study of the frequency of letters or groups of letters in a ciphertext
letters in a ciphertext. The method is used as an aid to breaking classical ciphers. Frequency analysis is based on the fact that, in any given stretch of
Frequency_analysis
Cryptography, the use of codes and ciphers, began thousands of years ago. Until recent decades, it has been the story of what might be called classical
History_of_cryptography
British annual reference book
Weltalmanach Europa World Year Book Whitaker's Almanack provides the key to a book cipher message at the beginning of Arthur Conan Doyle's 1915 Sherlock Holmes
Whitaker's_Almanack
Encoding for text messages
timing of the taps to isolate letters. To communicate the word "hello", the cipher would be the following (with the pause between each number in a pair being
Tap_code
cipher expert who coded the messages sent to Britain. As the codebooks had been destroyed, she laboriously used the MI6 emergency code, a book cipher
Margaret Reid (intelligence officer)
Margaret_Reid_(intelligence_officer)
Early unclassified symmetric-key block cipher
design elements, a relatively short key length of the symmetric-key block cipher design, and the involvement of the NSA, raising suspicions about a backdoor
Data_Encryption_Standard
Cryptographic cipher device
using digits. It also is known as a monôme-binôme cipher. In 1555, Pope Paul IV created the office of Cipher Secretary to the Pontiff. In the late 1580s, this
Straddling_checkerboard
Cipher system attributed to Thomas Jefferson
Jefferson disk, also called the Bazeries cylinder or wheel cypher, is a cipher system commonly attributed to Thomas Jefferson that uses a set of wheels
Jefferson_disk
Book by George Sassoon
maritime radiocommunications. The book also include an exposition of encryption, including the public key RSA cipher and presciently expounds on the lack
The_Radio_Hacker's_Codebook
American professor of English literature (1865–1940)
Lay Book on the Biliteral Cipher" with numbered chapters on two-letter ciphers, the biliteral letter cipher, the type of spirit cipher, and the book cipher
John_Matthews_Manly
Collection of 60 folios regarding magical initiation rituals
The Cipher Manuscripts are a collection of 60 folios containing the structural outline of a series of magical initiation rituals corresponding to the spiritual
Cipher_Manuscripts
2018 book about the Enigma machine
teams that worked on decrypting messages transmitted using the Enigma cipher. The book was published in English, Polish, French, and Greek and garnered positive
X,_Y_&_Z
Block cipher
Algorithm (TDEA or Triple DEA), is a symmetric-key block cipher, which applies the DES cipher algorithm three times to each data block. The 56-bit key
Triple_DES
Symmetric encryption cipher
The four-square cipher is a manual symmetric encryption technique. It was invented by the French cryptographer Felix Delastelle. The technique encrypts
Four-square_cipher
Vimes). Terry Pratchett's Discworld Book Cipher Pol The main intelligence agency of the World Government, Cipher Pol cells are located throughout the
List of fictional secret police and intelligence organizations
List_of_fictional_secret_police_and_intelligence_organizations
Method for writing secret messages
messages inside an ordinary letter so that the whole would not appear to be a cipher at all. Such a disguised message is considered to be an example of steganography
Cardan_grille
Fantasy book series by Steven Erikson
Turns out, the answer is yes, as epitomized in the Malazan Book of the Fallen (the cipher unlocking the metafictional element to the series is found in
Malazan_Book_of_the_Fallen
Cipher used by the UK in World War II
words a number. The numbers are then used as a key for a transposition cipher to conceal the plaintext of the message, often by double transposition.
Poem_code
American cryptanalytic organization
Chamber, officially the Cable and Telegraph Section and also known as the Cipher Bureau,[clarification needed] was the first peacetime cryptanalytic organization
Black_Chamber
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