8-9. Create an implementation of the atbash cipher, system created in the Middle East. an ancient encryption The Atbash ciphe
501 502 Juestion 9 503 504 @param string ereturn 505 506 public static String decode (String string) ( // TODO Write an imple 8-9. Create an implementation of the atbash cipher, system created in the Middle East. an ancient encryption The Atbash cipher is a s imple substitution cipher that relies on transposing all the letters in the alphabet such that the resulting alphabet is backwards. The first letter is replaced with the last letter, the second with the second-last, and so on. An Atbash cipher for the Latin alphabet would be as follows: Plain: abcdefghijklmnopqrstuvwxyz Cipher: zyxvuts rqponmlkjihgfedcba It is a very weak cipher because it only has one monoalphabetic substitution cipher. However, this may not have been an issue in the cipher’s time. possible key, and it is a simple Ciphertext is written out in groups of fixed length, the traditional group size being 5 letters, and punctuation is excluded. This is to make it harder to guess things based on word boundaries. Examples Encoding test gives gvhg Decoding gvhg gives test Decoding gsvif expyi ldmul cqfnk hlevi gsvoz abwlt gives thequickbrownfoxjumpsoverthelazydog Cipher ( static class Atba 501 502 Juestion 9 503 504 @param string ereturn 505 506 public static String decode (String string) ( // TODO Write an implementation for this method declaration return null; 507e 508 509 510 511 512



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