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Merged
raklaptudirm merged 5 commits into from
May 23, 2021
Merged

Create AtBash.js #317

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4f19129
Create AtBash.js
aryabharat Oct 1, 2020
23d1bfd
Update AtBash.js
itsvinayak Oct 1, 2020
4a8443d
Update and rename AtBash.js to Atbash.js
aryabharat Oct 3, 2020
5023cdd
Update Atbash.js
aryabharat Oct 3, 2020
985e193
Update Atbash.js
aryabharat Oct 3, 2020
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29 changes: 29 additions & 0 deletions Ciphers/Atbash.js
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Original file line number Diff line number Diff line change
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/*
The Atbash cipher is a particular type of monoalphabetic cipher
formed by taking the alphabet 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.
*/

/**
* Decrypt a Atbash cipher
* @param {String} str - string to be decrypted/encrypt
* @return {String} decrypted/encrypted string
*/
function Atbash (message) {
let decodedString = ''
for (let i = 0; i < message.length; i++) {
if (/[^a-zA-Z]/.test(message[i])) {
decodedString += message[i]
} else if (message[i] === message[i].toUpperCase()) {
decodedString += String.fromCharCode(90 + 65 - message.charCodeAt(i))
} else {
decodedString += String.fromCharCode(122 + 97 - message.charCodeAt(i))
}
}
return decodedString
}
// Atbash Example
const encryptedString = 'HELLO WORLD'
const decryptedString = Atbash(encryptedString)
console.log(decryptedString) // SVOOL DLIOW
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