SpaceCrypt

Hide text in plain sight using zero-width secret space characters.

Encrypt any Text -

$spaceCrypt = new SpaceCrypt("We're not the same text, even though we look the same.");
echo $spaceCrypt->encrypt("This is a Hidden Message.");

this will generate the message - This ‌​‌​‌‌‌⁠‌‌​​‌​‌⁠‌​​‌‌‌⁠‌‌‌​​‌​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌​‌‌‌​⁠‌‌​‌‌‌‌⁠‌‌‌​‌​​⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌‌​​‌‌⁠‌‌​​​​‌⁠‌‌​‌‌​‌⁠‌‌​​‌​‌⁠‌‌‌​​​‌​⁠‌​​​​​​​⁠‌​​​‌​‌‌⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​​‌​‌⁠‌‌‌‌​​​⁠‌‌‌​‌​​⁠‌​‌‌​​⁠‌​​​​​⁠‌‌​​‌​‌⁠‌‌‌​‌‌​⁠‌‌​​‌​‌⁠‌‌​‌‌‌​⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​‌‌‌‌⁠‌‌‌​‌​‌⁠‌‌​​‌‌‌⁠‌‌​‌​​​⁠‌​​​​​⁠‌‌‌​‌‌‌⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌​‌‌​​⁠‌‌​‌‌‌‌⁠‌‌​‌‌‌‌⁠‌‌​‌​‌‌⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌‌​​‌‌⁠‌‌​​​​‌⁠‌‌​‌‌​‌⁠‌‌​​‌​‌⁠‌​‌‌‌​is a Hidden Message.

Now, Decrypt the Hidden Text -

$spaceCrypt = new SpaceCrypt("This ‌​‌​‌‌‌⁠‌‌​​‌​‌⁠‌​​‌‌‌⁠‌‌‌​​‌​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌​‌‌‌​⁠‌‌​‌‌‌‌⁠‌‌‌​‌​​⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌‌​​‌‌⁠‌‌​​​​‌⁠‌‌​‌‌​‌⁠‌‌​​‌​‌⁠‌‌‌​​​‌​⁠‌​​​​​​​⁠‌​​​‌​‌‌⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​​‌​‌⁠‌‌‌‌​​​⁠‌‌‌​‌​​⁠‌​‌‌​​⁠‌​​​​​⁠‌‌​​‌​‌⁠‌‌‌​‌‌​⁠‌‌​​‌​‌⁠‌‌​‌‌‌​⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​‌‌‌‌⁠‌‌‌​‌​‌⁠‌‌​​‌‌‌⁠‌‌​‌​​​⁠‌​​​​​⁠‌‌‌​‌‌‌⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌​‌‌​​⁠‌‌​‌‌‌‌⁠‌‌​‌‌‌‌⁠‌‌​‌​‌‌⁠‌​​​​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌‌​​‌​‌⁠‌​​​​​⁠‌‌‌​​‌‌⁠‌‌​​​​‌⁠‌‌​‌‌​‌⁠‌‌​​‌​‌⁠‌​‌‌‌​is a Hidden Message.");
echo $spaceCrypt->decrypt();

this will reveal the actual message - We're not the same text, even though we look the same.

How This Works

SpaceCrypt works by converting your private message into binary data, and then converting that binary data into zero-width characters (which can then be hidden in your public message). These characters are used:

Unicode Character 'WORD JOINER' (U+2060)
Unicode Character 'ZERO WIDTH SPACE' (U+200B)
Unicode Character 'ZERO WIDTH NON-JOINER' (U+200C)

Tests

✅ Slack
✅ Twitter
✅ WhatsApp
✅ Telegram
✅ Keybase
✅ iMessage
✅ MacOS general copy/paste
✅ Hangouts

Inspired from a Article by Zach Aysan