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Steganography
Steganography ( ) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination. In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video. Generally, the hidden messages appear to be (or to be part of) something else: images, articles, shopping lists, or some other cover text. For example, the hidden message may be in invisible ink between the visible lines of a private letter. Some implementations of steganography that lack a formal shared secret are forms of security through obscurity, while key-dependent steganographic schemes try to adhere to Kerckhoffs's principle. The word ''steganography'' comes from Greek ''steganographia'', which combines the words ''steganós'' (), meaning "covered or concealed", and ''-graphia'' () meaning "writing". The fir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ave Maria Cipher
''Polygraphia'' is a cryptographic work written by Johannes Trithemius published in 1518 dedicated to the art of steganography. The full title is modern traditions of witchcraft">Theban alphabet">Witches' Alphabet, used at large by Wicca">modern traditions of witchcraft.Heinrich Cornelius Agrippa (1531). ''Three Books of Occult Philosophy''. Review It is composed of six books and a Key (cryptography), decrypytion key * Book I contains no fewer than 384 alphabets (called "minutiae" by the author) of 24 letters (or "degrees"): each letter corresponds to a Latin word (noun, verb, adjective, etc.) in reference to Christian prayers and religious texts, being in total 9,216 different words. This is nowadays known as the cipher, which mostly uses only a few of the first alphabets. * Book II contains 308 more Latin alphabets with 7,392 words, again using Latin words with mostly religious context. * Book III presents 132 alphabets in three columns which are 3,168 dictions of a "un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polygraphia (book)
''Polygraphia'' is a cryptography, cryptographic work written by Johannes Trithemius published in 1518 dedicated to the art of steganography. The full title is [Six books of polygraphy, by Johannes Trithemius, abbot at Würzburg, formerly at Spanheim, for the Emperor Maximilian I, Holy Roman Emperor, Maximilian ]. It is the oldest known source of the popular Theban alphabet, Witches' Alphabet, used at large by Wicca, modern traditions of witchcraft.Heinrich Cornelius Agrippa (1531). ''Three Books of Occult Philosophy''. Review It is composed of six books and a Key (cryptography), decrypytion key * Book I contains no fewer than 384 alphabets (called "minutiae" by the author) of 24 letters (or "degrees"): each letter corresponds to a Latin word (noun, verb, adjective, etc.) in reference to Christian prayers and religious texts, being in total 9,216 different words. This is nowadays known as the cipher, which mostly uses only a few of the first alphabets. * Book II contains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johannes Trithemius
Johannes Trithemius (; 1 February 1462 – 13 December 1516), born Johann Heidenberg, was a German Benedictine abbot and a polymath who was active in the German Renaissance as a Lexicography, lexicographer, chronicler, Cryptography, cryptographer, and occultist. He is considered the founder of modern cryptography (a claim shared with Leon Battista Alberti) and steganography, as well as the founder of bibliography and literary studies as branches of knowledge. He had considerable influence on the development of Early modern period, early modern and modern occultism. His students included Heinrich Cornelius Agrippa and Paracelsus. Early life The Epithet, byname ''Trithemius'' refers to his native town of Trittenheim on the Moselle (river), Moselle River, at the time part of the Electorate of Trier. When Johannes was still an infant his father, Johann von Heidenburg, died. His stepfather, whom his mother Elisabeth married seven years later, was hostile to education and thus Johann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steganographia
''Steganographia'' is a book on steganography, written in c. 1499 by the German Benedictine abbot and polymath Johannes Trithemius. General Trithemius' most famous work, ''Steganographia'' (written c.1499; published Frankfurt, 1606), was placed on the ''Index Librorum Prohibitorum'' in 1609 and removed in 1900. This book is in three volumes, and appears to be about magic—specifically, about using spirits to communicate over long distances. However, since the publication of a decryption key to the first two volumes in 1606, they were discovered to be actually concerned with cryptography and steganography. Until 1996, the third volume was widely believed to be solely about magic, but the "magical" formulas have now been shown to be covertexts for yet more material on cryptography. Reception References within the third book to magical works by such figures as Agrippa and John Dee still lend credence to the idea of a mystic-magical foundation of the third volume. Additionally, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptography
Cryptography, or cryptology (from "hidden, secret"; and ''graphein'', "to write", or ''-logy, -logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of Adversary (cryptography), adversarial behavior. More generally, cryptography is about constructing and analyzing Communication protocol, protocols that prevent third parties or the public from reading private messages. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, information security, electrical engineering, digital signal processing, physics, and others. Core concepts related to information security (confidentiality, data confidentiality, data integrity, authentication, and non-repudiation) are also central to cryptography. Practical applications of cryptography include electronic commerce, Smart card#EMV, chip-based payment cards, digital currencies, password, computer passwords, and military communications. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microdot
A microdot is text or an image substantially reduced in size to prevent detection by unintended recipients. Microdots are normally circular and around in diameter but can be made into different shapes and sizes and made from various materials such as polyester or metal. The name comes from microdots often having been about the size and shape of a typography, typographical dot, such as a full stop, period or the tittle of a lowercase ''i'' or ''j''. Microdots are, fundamentally, a steganography, steganographic approach to message protection. History In 1870 during the Franco-Prussian War, Paris was under siege and messages were sent by carrier pigeon. Parisian photographer René Dagron used microfilm to permit each pigeon to carry a high volume of messages, as pigeons can carry little weight. Improvement in technology since then has made even smaller miniaturization possible. At the 1925 International Congress of Photography in Paris, Emanuel Goldberg presented a method of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Histories Of Herodotus
The ''Histories'' (, ''Historíai''; also known as ''The History'') of Herodotus is considered the founding work of history in Western literature. Although not a fully impartial record, it remains one of the West's most important sources regarding these affairs. Moreover, it established the genre and study of history in the Western world (despite the existence of historical records and chronicles beforehand). ''The'' ''Histories'' also stands as one of the earliest accounts of the rise of the Persian Empire, as well as the events and causes of the Greco-Persian Wars between the Persian Empire and the Greek city-states in the 5th century BC. Herodotus portrays the conflict as one between the forces of slavery (the Persians) on the one hand, and freedom (the Athenians and the confederacy of Greek city-states which united against the invaders) on the other. ''The Histories'' was at some point divided into the nine books that appear in modern editions, conventionally named after the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Music Cipher
In 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 the same as musical cryptograms. The latter were systems used by composers to create musical Subject (music), themes or motif (music), motifs to represent names based on similarities between letters of the alphabet and musical note names, such as the BACH motif, whereas music ciphers were systems typically used by cryptographers to hide or code, encode messages for reasons of secrecy or espionage. Types There are a variety of different types of music ciphers as distinguished by both the method of encryption and the musical symbols used. Regarding the former, most are simple substitution ciphers with a one-to-one correspondence between individual letters of the alphabet and a specific musical note. There are also historical music ciphers that utilize homophonic substitution (one-to-many), polyalphabetic substitution, polyphonic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Invisible Ink
Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light. Invisible ink is one form of steganography. History One of the earliest writers to mention an invisible ink is Aeneas Tacticus, in the 4th century BC. He mentions it in discussing how to survive under siege but does not indicate the type of ink to be used. This was part of his list of the 20 different methods of secret communications in a book called ''On the Defense of Fortifications''. One of the techniques that involved steganography involved puncturing a tiny hole above or below letters in a document to spell out a secret message. This did not include an invisible ink but the Germans improved on the method during World War I and World War II. They used invisible ink and microdots instead of pinpricks. Philo of Byzantium may be the first write ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
