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In 1968 Shirley Chisholm became the first Black woman elected to the United States Congress. In 1972 she launched a campaign for the Democratic presidential nomination, breaking another political barrier.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
 | This article relies on a single source. (August 2015) |
Atbash (Hebrew: 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.
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 ISO basic Latin alphabet would work like this:
| Plain | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cipher | Z | Y | X | W | V | U | T | S | R | Q | P | O | N | M | L | K | J | I | H | G | F | E | D | C | B | A |
Because there is only one way to perform this (which means there is only one possibility), 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.
The name derives from the first, last, second, and second to last Hebrew letters (Aleph–Taw–Bet–Shin).
The Atbash cipher for the modern Hebrew alphabet would be:
| ◢→ | Aleph | Bet | Gimel | Daleth | Heh | Vav | Zayin | Het | Tet | Yodh | Kaph | Lamed | Mem | Nun | Samech | Ayin | Peh | Tzady | Koof | Reish | Shin | Taw |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plain | א | ב | ג | ד | ה | ו | ז | ח | ט | י | כ | ל | מ | נ | ס | ע | פ | צ | ק | ר | ש | ת |
| ◢← | Taw | Shin | Reish | Koof | Tzady | Peh | Ayin | Samech | Nun | Mem | Lamed | Kaph | Yodh | Tet | Het | Zayin | Vav | Heh | Daleth | Gimel | Bet | Aleph |
| Cipher | ת | ש | ר | ק | צ | פ | ע | ס | נ | מ | ל | כ | י | ט | ח | ז | ו | ה | ד | ג | ב | א |
By shifting the correlation one space to the left or the right, one may derive a variant Batgash (named for Bet–Taw–Gimel–Shin) or Ashbar (for Aleph–Shin–Bet–Reish). Either alternative mapping leaves one letter unsubstituted; respectively Aleph and Taw.
Several biblical words are described by commentators[n 1] as being examples of Atbash:[1][2][3]
Regarding a potential Atbash switch of a single letter:
The Atbash cipher can be seen as a special case of the affine cipher.
Under the standard affine convention, an alphabet of m letters is mapped to the numbers 0, 1, ... , m − 1. (The Hebrew alphabet has m = 22, and the standard Latin alphabet has m = 26). The Atbash cipher may then be enciphered and deciphered using the encryption function for an affine cipher by setting a = b = (m − 1):
This may be simplified to
If, instead, the m letters of the alphabet are mapped to 1, 2, ..., m, then the encryption and decryption function for the Atbash cipher becomes
Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
Atbash (Hebrew: 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.
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 procedure. An alternative, less common term is encipherment. To encipher or encode is to convert information into cipher or code. In common parlance, "cipher" is synonymous with "code", as they are both a set of steps that encrypt a message; however, the concepts are distinct in cryptography, especially classical cryptography. Codes generally substitute different length strings of characters in the output, while ciphers generally substitute the same number of characters as are input. A code maps one meaning with another. Words and phrases can be coded as letters or numbers. Codes typically have direct meaning from input to key. Codes primarily function to save time. Ciphers are algorithmic. The given input must follow the cipher's process to be solved. Ciphers are commonly used to encrypt written information. Codes operated by substituting according to a large codebook which linked a random string of characters or numbers to a word or phrase. For example, "UQJHSE" could be the code for "Proceed to the following coordinates.". When using a cipher the original information is known as plaintext, and the encrypted form as ciphertext. The ciphertext message contains all the information of the plaintext message, but is not in a format readable by a human or computer without the proper mechanism to decrypt it. The operation of a cipher usually depends on a piece of auxiliary information, called a key (or, in traditional NSA parlance, a cryptovariable). The encrypting procedure is varied depending on the key, which changes the detailed operation of the algorithm. A key must be selected before using a cipher to encrypt a message, with some exceptions such as ROT13 and Atbash. Most modern ciphers can be categorized in several ways: By whether they work on blocks of symbols usually of a fixed size (block ciphers), or on a continuous stream of symbols (stream ciphers). By whether the same key is used for both encryption and decryption (symmetric key algorithms), or if a different key is used for each (asymmetric key algorithms). If the algorithm is symmetric, the key must be known to the recipient and sender and to no one else. If the algorithm is an asymmetric one, the enciphering key is different from, but closely related to, the deciphering key. If one key cannot be deduced from the other, the asymmetric key algorithm has the public/private key property and one of the keys may be made public without loss of confidentiality.
In numerology, gematria (; Hebrew: גמטריא or גימטריה, gimatriyyā, plural גמטראות or גימטריות, gimatriyyot, borrowed via Aramaic from Koine Greek: γραμμάτια) is the practice of assigning a numerical value to a name, word, or phrase by reading it as a number, or sometimes by using an alphanumeric cipher. The letters of the alphabets involved have standard numerical values, but a word can yield several values if a cipher is used. According to Aristotle (384–322 BCE), isopsephy, based on the Greek numerals developed in the city of Miletus in Anatolia, was part of Pythagoreanism, which originated in the 6th century BCE. The first evidence of use of Hebrew letters as numbers dates to 78 BCE; gematria is still used in Jewish culture. Similar systems have been used in other languages and cultures, derived from or inspired by either Greek isopsephy or Hebrew gematria, and include Arabic abjad numerals and English gematria. The most common form of Hebrew gematria is used in the Talmud and Midrash as in Jerusalem Talmud, Genesis Rabba 95:3, and elaborately in Rabbinic literature. It involves reading words and sentences as numbers and assigning numerical instead of phonetic values to each letter of the Hebrew alphabet. When read as numbers, they can be compared and contrasted with other words or phrases; cf. the Hebrew proverb נִכְנַס יַיִן יָצָא סוֹד (Nik̲nas yayin yāṣāʾ soḏ, lit. 'wine entered, secret went out', i.e. in vino veritas). The gematric value of יין ('wine') is 70 (י=10; י=10; ן=50) and this is also the gematric value of סוד ('secret', ס=60; ו=6; ד=4), cf. Babylonian Talmud, tractate Sanhedrin 38a. Gematria sums can involve single words or lengthy strings of calculations. A short example of Hebrew numerology that uses gematria is the word חי, chai, 'alive', which is composed of two letters that (using the assignments in the mispar gadol table shown below) add up to 18. This has made 18 a "lucky number" among Jews. In early Jewish sources, the term can also refer to other forms of calculation or letter manipulation, for example atbash.
Sheshach (Hebrew: 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 antiquity, which consisted in substituting the last 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 (forming the word Babel). This code is 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. 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. A similar instance of this Hebrew cryptographic method occurs in Jeremiah 51:1, where Leb Kamai is code for Chaldea.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →The Greenwood District.
