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Add ROT13 cipher #463

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Merged
itsvinayak merged 2 commits into from
Oct 12, 2020
Merged

Add ROT13 cipher #463

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4f521db
Add ROT13 cipher
Oct 11, 2020
c671a51
Update ROT13.js
itsvinayak Oct 12, 2020
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21 changes: 21 additions & 0 deletions Ciphers/ROT13.js
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Original file line number Diff line number Diff line change
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/**
* Transcipher a ROT13 cipher
* @param {String} text - string to be encrypted
* @return {String} - decrypted string
*/
const transcipher = (text) => {
const originalCharacterList = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
const toBeMappedCharaterList = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm'
const index = x => originalCharacterList.indexOf(x)
const replace = x => index(x) > -1 ? toBeMappedCharaterList[index(x)] : x
return text.split('').map(replace).join('')
}

(() => {
const messageToBeEncrypted = 'The quick brown fox jumps over the lazy dog'
console.log(`Original Text = "${messageToBeEncrypted}"`)
const rot13CipheredText = transcipher(messageToBeEncrypted)
console.log(`Ciphered Text = "${rot13CipheredText}"`)
const rot13DecipheredText = transcipher(rot13CipheredText)
console.log(`Deciphered Text = "${rot13DecipheredText}"`)
})()