The Hebrew alphabet, run through Atbash. Atbash ( : אתבש ; also transliterated Atbaš ) is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet . I...
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:
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, and second to last Hebrew letters (Aleph–Taw–Bet–Shin).
Gimel–Shin) or Ashbar (for Aleph–Shin–Bet–Reish). Either alternative mapping leaves one letter unsubstituted; respectively Aleph and Taw.
In the Bible
Several biblical words are described by commentators as being examples of Atbash:
Jeremiah 25:26 – "The king of Sheshach shall drink after them" – Sheshach meaning Babylon in Atbash (בבלbbl → Lev-kamai, a destroying wind." – Lev-kamai meaning Chaldeans (Sheshach been captured! and the praise of the whole earth taken! How has Babylon become a curse among the nations!" – Sheshach meaning Babylon (I will mention My name" (you will mention My name" (Yom Tov Asevilli
Relationship to the affine cipher
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
This may be simplified to
If, instead, the m letters of the alphabet are mapped to
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