Atbash Cipher.

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Presentation transcript:

Atbash Cipher

Atbash Atbash (c. 500 BC) Atbash (also transliterated Atbaš) is a simple substitution cipher originally for the Hebrew alphabet, but possible with any known alphabet. History Atbash is a simple substitution cipher for the Hebrew alphabet. It consists of substituting aleph (the first letter) for tav (the last), beth (the second) for shin (the one before last), and so on, reversing the alphabet. Note that modern Hebrew is written right-to-left. In the Book of Jeremiah, לב קמי Lev Kamai (51:1) is Atbash for כשדים Kasdim (Chaldeans), and ששך Sheshakh (25:26; 51:41) is Atbash for בבל Bavel (Babylon).

Atbash It is considered a 'weak' or 'simple' cipher because it only has one possible key, and it is a simple monoalphabetic substitution cipher. However, this may not have been an issue at the time when the cipher was first devised.

Atbash Substitution Ciphers Atbash cipher substitutes the corresponding letter from the reverse alphabet Caesar cipher substitutes the letter three later in the alphabet (wrapping back around to the beginning) ABC  ZYX ABC  DEF HELLO  SVOOL HELLO  KHOOR substitution ciphers are easy to understand and use

Example NZGS RH UFM Decrypt using Atbash MATH IS FUN

Example GSV VZTOV SZH OZMWVW The eagle has landed A B C D E F G H I J K L M Z Y X W V U T S R Q P O N GSV VZTOV SZH OZMWVW The eagle has landed