use braille patterns for base64, instead of alphanumerics. joke.

base⠼⠋⠙.php

<?php

function _b64enc($in, $padding = false)
{
    $inLen = count($in);
    $out = [];
    for ($i = 0; $i < $inLen; $i += 3)
    {
        $out[] = $in[$i] >> 2;
        if ($i + 1 < $inLen)
        {
            $out[] = (($in[$i] << 4) | ($in[$i + 1] >> 4)) & 63;
            if ($i + 2 < $inLen)
            {
                $out[] = (($in[$i + 1] << 2) | ($in[$i + 2] >> 6)) & 63;
                $out[] = $in[$i + 2] & 63;
            }
            else
            {
                $out[] = ($in[$i + 1] << 2) & 63;
                if ($padding)
                    $out[] = -1;
            }
        }
        else
        {
            $out[] = ($in[$i] << 4) & 63;
            if ($padding)
            {
                $out[] = -1;
                $out[] = -1;
            }
        }
    }
    return $out;
}

function _b64dec($in, $padding = false)
{
    $inLen = count($in);
    if (!$padding)
    {
        $in[] = -1;
        $in[] = -1;
    }
    $out = [];
    for ($i = 0; $i < $inLen; $i += 4)
    {
        $o = ($in[$i] << 18) | ($in[$i + 1] << 12);
        $r = 1;
        if ($in[$i + 2] >= 0)
        {
            $o |= $in[$i + 2] << 6;
            $r = 2;
            if ($in[$i + 3] >= 0)
            {
                $o |= $in[$i + 3];
                $r = 3;
            }
        }
        $out[] = $o >> 16;
        if ($r >= 2)
        {
            $out[] = ($o >> 8) & 255;
            if ($r >= 3)
                $out[] = $o & 255;
        }
    }
    return $out;
}

function unichr($i) {
    return iconv('UCS-4LE', 'UTF-8', pack('V', $i));
}

function uniord($u) {
    $k = mb_convert_encoding($u, 'UCS-2LE', 'UTF-8');
    $k1 = ord(substr($k, 0, 1));
    $k2 = ord(substr($k, 1, 1));
    return $k2 * 256 + $k1;
}

function braille_encode($text)
{
    preg_match_all('/./', $text, $out);
    $b64 = _b64enc(array_map('ord', $out[0]), false);
    return join('', array_map(function($x) {
        return unichr($x + 0x2800);
    }, $b64));
}

function braille_decode($text)
{
    $chars = preg_split('/(?!^)(?=.)/u', $text);
    $data = _b64dec(array_map(function($c) {
        return uniord($c) - 0x2800;
    }, $chars), false);
    return join('', array_map('chr', $data));
}

base⠼⠋⠙.py

#!/usr/bin/env python
#coding:utf-8

import sys

def base64_encode_(in_data, padding=False):
    in_len = len(in_data)
    out_data = []
    for i in range(0, in_len, 3):
        out_data.append(in_data[i] >> 2)
        if i+1 < in_len:
            out_data.append(((in_data[i] << 4) | (in_data[i+1] >> 4)) & 63)
            if i+2 < in_len:
                out_data.append(((in_data[i+1] << 2) | (in_data[i+2] >> 6)) & 63)
                out_data.append(in_data[i+2] & 63)
            else:
                out_data.append((in_data[i+1] << 2) & 63)
                if padding:
                    out_data.append(-1)
        else:
            out_data.append((in_data[i] << 4) & 63)
            if padding:
                out_data.append(-1)
                out_data.append(-1)

    return out_data

def base64_decode_(in_data, padding=False):
    in_len = len(in_data)
    if not padding:
        in_data.append(-1)
        in_data.append(-1)
    out_data = []
    for i in range(0, in_len, 4):
        o = (in_data[i] << 18) | (in_data[i+1] << 12)
        r = 1
        if in_data[i+2] >= 0:
            o |= (in_data[i+2] << 6)
            r = 2
            if in_data[i+3] >= 0:
                o |= in_data[i+3]
                r = 3
        out_data.append(o >> 16)
        if r >= 2:
            out_data.append((o >> 8) & 255)
            if r >= 3:
                out_data.append(o & 255)
    return out_data

def ord64(s):
    if s == '=': return -1
    elif s == '+': return 62
    elif s == '/': return 63
    c = ord(s)
    if c < 0x30: return -1
    elif c <= 0x39: return c - 0x30 + 52
    elif c < 0x41: return -1
    elif c <= 0x5A: return c - 0x41
    elif c < 0x61: return -1
    elif c <= 0x7A: return c - 0x61 + 26
    return -1

BASE64_TABLE = "=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
def base64_encode(text):
    b64 = base64_encode_(map(ord, text), padding=True)
    return ''.join(map(lambda x:BASE64_TABLE[1+x], b64))

def base64_decode(text):
    data = base64_decode_(map(ord64, text), padding=True)
    return ''.join(map(chr, data))

def base64t_encode(text):
    b64 = base64_encode_(map(ord, text), padding=False)
    return ''.join(map(lambda x:unichr(0x2800+x), b64)).encode('utf-8')

def base64t_decode(text):
    data = base64_decode_(map(lambda c:ord(c)-0x2800, text.decode('utf-8')), padding=False)
    return ''.join(map(chr, data))


assert("QUJDREVGRw==" == base64_encode("ABCDEFG"))
assert("ABCDEFG" == base64_decode("QUJDREVGRw=="))

assert("⠐⠔⠉⠃⠑⠄⠕⠆⠑⠰" == base64t_encode("ABCDEFG"))
assert("ABCDEFG" == base64t_decode("⠐⠔⠉⠃⠑⠄⠕⠆⠑⠰"))

if __name__ == '__main__':
    for line in sys.stdin:
        enc = base64t_encode(line.rstrip())
        dec = base64t_decode(enc)
        print enc, dec