cipher-font

Usage

var cipher = require('cipher-font');

cipher(
    'path/to/source_font.otf',
    'path/to/output_font.otf',
    'optional seed string'
)
.then((cipherMapping) => {
    // the mapping is an object where
    // characters map as keys to ciphered characters
    
    console.log('A is now ' + cipherMapping['A'] + '!');
});

When you've ciphered your string, use the generated font to render it. The user should see the original text, but a scrape of the text will still read as ciphered.

Obviously this is not incredibly secure (it's the most basic of cryptography), but it's about as advanced as I think I can take this concept unless I have a better idea, and it should fool most bots which aren't really looking for it.

Or maybe you have more prank-related ideas? I'm not saying you should set your friend's default editor font to a generated font, only that it's a possibility which may send him digging into his keyboard language settings to figure out why the wrong letters are coming out.

Mapped Characters

The library currently just maps any characters in the following string:

' .?!,:;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'