https://github.com/marfullsen/rot13-transcoder

Website to translate the Caesar's cipher (rotation system).
https://github.com/marfullsen/rot13-transcoder

caesar-cipher encryption foundation

Last synced: 6 months ago
JSON representation

Website to translate the Caesar's cipher (rotation system).

• Host: GitHub
• URL: https://github.com/marfullsen/rot13-transcoder
• Owner: Marfullsen
• Created: 2021-03-11T08:41:24.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2021-04-12T02:30:03.000Z (almost 5 years ago)
• Last Synced: 2025-01-10T05:36:30.081Z (about 1 year ago)
• Topics: caesar-cipher, encryption, foundation
• Language: CSS
• Homepage: https://marfullsen.github.io/rot13-transcoder/
• Size: 1.07 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
# Rot13 Transcoder

[![Foundation version](https://img.shields.io/badge/Foundation-6.6.3-blue.svg)](https://get.foundation/)

[![JS](https://img.shields.io/badge/Vanilla-JavaScript-yellow.svg)](https://www.javascript.com/)

[![Github.io](https://img.shields.io/badge/GitHub%20Pages-Rot13%20transcoder-green.svg)](https://Marfullsen.github.io/rot13-transcoder/)

[![Screenshot](./screenshot_rot13_index.png)](https://Marfullsen.github.io/rot13-transcoder/)

---

## Description

[Site](https://Marfullsen.github.io/rot13-transcoder/) for encrypting and decrypting ciphertext with [rot13](https://en.wikipedia.org/wiki/ROT13).

---

## History

ROT13 is a special case of the encryption algorithm known as a Caesar cipher, used by Julius Caesar in the 1st century BC

---

## How it works

The cipher consists of replacing each letter of the alphabet with the letter that is thirteen positions ahead, thus, each letter would be as follows:

| Input | ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz |

| --- | --- |

| Output | NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm |

An example of the use of encryption would be:

__The Quick Brown Fox Jumps Over The Lazy Dog.__

>_Gur Dhvpx Oebja Sbk Whzcf Bire Gur Ynml Qbt._

---

## Usage when download the repo.

1. Install `git`.

2. Clone, enter the directory and open directly with any browser.

*Things like Live Server are optional.

``` 

git clone https://github.com/Marfullsen/rot13-transcoder.git

cd rot13-transcoder

```

3. Enjoy!

---

## The encode/decode code

[![Screenshot](./TheZenOfMarfullsen.png)](https://Marfullsen.github.io/rot13-transcoder/)

```

let d = {};

function chr(numero){

  return String.fromCharCode(numero);

}

for (const c of [65, 97]) {

  for (var i=0; i<26; i++) {

    d[chr(i+c)] = chr((i+13) % 26 + c)

  }  

}

function transcode(msg) {

    resp = ''

    for (letter of msg){

        resp += d[letter]? d[letter] : ' ';

    }

    return resp;

}

console.log(d)

console.log(transcode('The Zen Of Marfullsen'))

```

## Visit the page:

[Marfullsen.github.io/rot13-transcoder](https://Marfullsen.github.io/rot13-transcoder/)

---

## Credit

This website is inspired by ["The Zen of Python"](https://www.python.org/dev/peps/pep-0020/).