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Atbash
Atbash ( he, אתבש; also transliterated Atbaš) is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use with any known writing system with a standard collating order. Encryption The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on. For example, the Latin alphabet would work like this: Due to the fact that there is only one way to perform this, the Atbash cipher provides no communications security, as it lacks any sort of key. If multiple collating orders are available, which one was used in encryption can be used as a key, but this does not provide significantly more security, considering that only a few letters can give away which one was used. History The name derives from the first, last, second, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atbash
Atbash ( he, אתבש; also transliterated Atbaš) is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use with any known writing system with a standard collating order. Encryption The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on. For example, the Latin alphabet would work like this: Due to the fact that there is only one way to perform this, the Atbash cipher provides no communications security, as it lacks any sort of key. If multiple collating orders are available, which one was used in encryption can be used as a key, but this does not provide significantly more security, considering that only a few letters can give away which one was used. History The name derives from the first, last, second, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substitution Cipher
In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing the inverse substitution process to extract the original message. Substitution ciphers can be compared with transposition ciphers. In a transposition cipher, the units of the plaintext are rearranged in a different and usually quite complex order, but the units themselves are left unchanged. By contrast, in a substitution cipher, the units of the plaintext are retained in the same sequence in the ciphertext, but the units themselves are altered. There are a number of different types of substitution cipher. If the cipher operates on single letters, it is termed a simple substitution cipher; a cipher that operates on larger groups of letters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheshach
Sheshach ( he, ששך), whose king is mentioned in the Hebrew Bible in Jeremiah 25:26, is supposed to be equivalent to Babel (Babylon), according to a secret mode of writing practiced among the Jews of unknown Ancient history, antiquity, which consisted in substituting the last Letter (alphabet), letter of the Hebrew alphabet for the first, the next to last one for the second, and so on. Thus the letters sh, sh, ch become b, b, l, i.e., Babel (see: Atbash cipher). This code is called the Atbash, 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. The Atbash Cipher was applied and out of "Sheshach" came the word "Babel". This is supposed to be confirmed by a reference to Jeremiah 51:41, where Sheshach and Babylon are in parallel clauses. There seems to be no reason to doubt that Babylon is here intended by this name.See Streane's ''Jeremiah'' A similar instance of this Hebrew cryptographic m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substitution Cipher
In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing the inverse substitution process to extract the original message. Substitution ciphers can be compared with transposition ciphers. In a transposition cipher, the units of the plaintext are rearranged in a different and usually quite complex order, but the units themselves are left unchanged. By contrast, in a substitution cipher, the units of the plaintext are retained in the same sequence in the ciphertext, but the units themselves are altered. There are a number of different types of substitution cipher. If the cipher operates on single letters, it is termed a simple substitution cipher; a cipher that operates on larger groups of letters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Affine 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 a simple mathematical function, and converted back to a letter. The formula used means that each letter encrypts to one other letter, and back again, meaning the cipher is essentially a standard substitution cipher with a rule governing which letter goes to which. As such, it has the weaknesses of all substitution ciphers. Each letter is enciphered with the function , where is the magnitude of the shift. Description Here, the letters of an alphabet of size are first mapped to the integers in the range . It then uses modular arithmetic to transform the integer that each plaintext letter corresponds to into another integer that correspond to a ciphertext letter. The encryption function for a single letter is :E(x)=(ax+b)\bmod where modulus is the size of the alphabet and and are the keys of the cipher. The value must be chosen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ROT13
ROT13 ("rotate by 13 places", sometimes hyphenated ROT-13) is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome. Because there are 26 letters (2×13) in the basic Latin alphabet, ROT13 is its own inverse; that is, to undo ROT13, the same algorithm is applied, so the same action can be used for encoding and decoding. The algorithm provides virtually no cryptographic security, and is often cited as a canonical example of weak encryption. ROT13 is used in online forums as a means of hiding spoilers, punchlines, puzzle solutions, and offensive materials from the casual glance. ROT13 has inspired a variety of letter and word games online, and is frequently mentioned in newsgroup conversations. Description Applying ROT13 to a piece of text merely requires examining its alphabetic characters and replacing each one by the letter 13 places further al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gematria
Gematria (; he, גמטריא or gimatria , plural or , ''gimatriot'') is the practice of assigning a numerical value to a name, word or phrase according to an alphanumerical cipher. A single word can yield several values depending on the cipher which is used. Hebrew alphanumeric ciphers were probably used in biblical times, and were later adopted by other cultures. Gematria is still widely used in Jewish culture. Similar systems have been used in other languages and cultures: the Greeks isopsephy, and later, derived from or inspired by Hebrew gematria, Arabic abjad numerals, and English gematria. Although a type of gematria system ('Aru') was employed by the ancient Babylonian culture, their writing script was logographic, and the numerical assignations they made were to whole words. The value of these words were assigned in an entirely arbitrary manner and correspondences were made through tables, and so cannot be considered a true form of gematria. Aru was very different from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temurah (Kabbalah)
Temurah () is one of the three ancient methods used by Kabbalists to rearrange words and sentences in the Bible, in the belief that by this method they can derive the esoteric substratum and deeper spiritual meaning of the words (the others are Gematria and Notarikon). Temurah may be used to change letters in certain words to create a new meaning for a Biblical statement. The Hebrew alphabet is an ''Abjad'' or consonantary alphabet. Techniques that applied to English will mostly transform sense into a nonsensical series of letters are more feasible in Hebrew.Renaissance and Rebirth , Brian Ogren, Brill, p. 155, There are three simple forms of Temurah: *'' Atbash'': Replacing the first letter with the last letter of the Hebrew alphabet, the second with the next-to-last, and so on. :א=ת, ב=ש, ג=ר, etc. *''Avgad'': Replacing each letter with the preceding letter. :א→ב, ב→ג, ג→ד *''Albam'': Replacing the first letter of the alphab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rashi
Shlomo Yitzchaki ( he, רבי שלמה יצחקי; la, Salomon Isaacides; french: Salomon de Troyes, 22 February 1040 – 13 July 1105), today generally known by the acronym Rashi (see below), was a medieval French rabbi and author of a comprehensive commentary on the Talmud and commentary on the Hebrew Bible (the ''Tanakh''). Acclaimed for his ability to present the basic meaning of the text in a concise and lucid fashion, Rashi appeals to learned scholars and beginning students, and his works remain a centerpiece of contemporary Jewish studies. His commentary on the Talmud, which covers nearly all of the Babylonian Talmud (a total of 30 out of 39 tractates, due to his death), has been included in every edition of the Talmud since its first printing by Daniel Bomberg in the 1520s. His commentaries on the Tanakh—especially his commentary on the Chumash (the "Five Books of Moses")—serves as the basis of more than 300 "supercommentaries" which analyze Rashi's choice of langu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Classical Ciphers
Classical may refer to: European antiquity *Classical antiquity, a period of history from roughly the 7th or 8th century B.C.E. to the 5th century C.E. centered on the Mediterranean Sea *Classical architecture, architecture derived from Greek and Roman architecture of classical antiquity *Classical mythology, the body of myths from the ancient Greeks and Romans *Classical tradition, the reception of classical Greco-Roman antiquity by later cultures *Classics, study of the language and culture of classical antiquity, particularly its literature *Classicism, a high regard for classical antiquity in the arts Music and arts *Classical ballet, the most formal of the ballet styles *Classical music, a variety of Western musical styles from the 9th century to the present *Classical guitar, a common type of acoustic guitar *Classical Hollywood cinema, a visual and sound style in the American film industry between 1927 and 1963 * Classical Indian dance, various codified art forms whose theo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hebrew Language
Hebrew (; ; ) is a Northwest Semitic language of the Afroasiatic language family. Historically, it is one of the spoken languages of the Israelites and their longest-surviving descendants, the Jews and Samaritans. It was largely preserved throughout history as the main liturgical language of Judaism (since the Second Temple period) and Samaritanism. Hebrew is the only Canaanite language still spoken today, and serves as the only truly successful example of a dead language that has been revived. It is also one of only two Northwest Semitic languages still in use, with the other being Aramaic. The earliest examples of written Paleo-Hebrew date back to the 10th century BCE. Nearly all of the Hebrew Bible is written in Biblical Hebrew, with much of its present form in the dialect that scholars believe flourished around the 6th century BCE, during the time of the Babylonian captivity. For this reason, Hebrew has been referred to by Jews as '' Lashon Hakodesh'' (, ) since an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Zvi Hoffmann
David Zvi Hoffmann (November 24, 1843, Verbó, Austrian Empire – November 20, 1921, Berlin) (Hebrew: דוד צבי הופמן), was an Orthodox Rabbi and Torah Scholar. He headed the Yeshiva in Berlin, and published research on the Pentateuch and Mishna, both in reaction to erstwhile Biblical criticism. He is referred to as רד"צ הופמן - ''Radatz Hoffmann'' - in later Rabbinic writing. He was an expert in Midrash halakha and the foremost halakhic authority in Germany in his generation. He is well known for his strident literary opposition to the Graf-Wellhausen theories of Biblical origin, while on the other hand, he quotes prominent Wissenschaft figures in his researches on Mishnah and Talmud. His commentary on the Pentateuch is still often referred to. Education and career Born in Verbó in 1843, he attended various Yeshivas in his native town before he entered the college at Pressburg, from which he graduated in 1865. He then studied philosophy, history, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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