arcade-encryption

A MakeCode Arcade extension offering multiple lightweight encryption methods — including Base64, Caesar, XOR, Substitution, ROT13, Atbash, and more — all hidden under non-obvious function names for simple obfuscation and privacy. Useful for text-based puzzles, encoding in games, or basic cipher education.

All functions are wrapped in the u8x3 namespace to avoid exposing terms like “Base64” or “cipher” directly in the MakeCode block interface.

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Features

• Base64 Encoding:
  u8x3.e1(txt: string) — Encodes a string into Base64 format
  u8x3.d2(dat: string) — Decodes Base64-encoded string back to original

• Caesar Cipher:
  u8x3.caesarEncrypt(txt, shift) — Caesar shift text
  u8x3.caesarDecrypt(txt, shift) — Reverses Caesar shift

• XOR Cipher:
  u8x3.xorCipher(txt, key) — Applies XOR between input and key

• Substitution Cipher:
  u8x3.generateSubstitutionKey() — Generates a random A–Z key
  u8x3.sE(txt, key) — Encrypts text using key
  u8x3.sD(txt, key) — Decrypts back to original

• Other Ciphers:
  u8x3.rC(txt) — Reverses the string
  u8x3.rot13(txt) — Applies ROT13 shift
  u8x3.atbash(txt) — Applies Atbash mirror cipher

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Installation

1. Go to https://arcade.makecode.com

2. Open your project, click Extensions in the section with the different block types

3. Paste in the URL in the search bar:

   https://github.com/Dumb-Dumb1/arcade-encryption
   

4. Click the extension and the blocks will appear under a new category called u8x3

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Blocks Overview

Block	Function
encrypt [txt]	u8x3.e1(txt)
decrypt [dat]	u8x3.d2(dat)
encrypt [txt] with Caesar shift	u8x3.caesarEncrypt(...)
decrypt [txt] with Caesar shift	u8x3.caesarDecrypt(...)
apply XOR cipher to [txt] with key	u8x3.xorCipher(...)
generate substitution key	u8x3.generateSubstitutionKey()
encrypt [txt] with substitution key	u8x3.sE(...)
decrypt [txt] with substitution key	u8x3.sD(...)
reverse [txt]	u8x3.rC(...)
apply ROT13 to [txt]	u8x3.rot13(...)
apply Atbash cipher to [txt]	u8x3.atbash(...)

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JavaScript / TypeScript Usage

let secret = u8x3.e1("Top Secret!")
let decoded = u8x3.d2(secret)

let caes = u8x3.caesarEncrypt("HELLO", 5)  // MJQQT
let undo = u8x3.caesarDecrypt(caes, 5)

let subKey = u8x3.generateSubstitutionKey()
let coded = u8x3.sE("hello", subKey)
let plain = u8x3.sD(coded, subKey)

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Notes

• Substitution keys must be exactly 26 unique uppercase letters (A-Z), no duplicates.
• This is not secure cryptography — it’s for simple encoding and game logic.
• Unicode handling is limited to UTF-16 BMP characters (most normal text is fine).

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License

MIT © Dumb-Dumb1