零宽度字符隐写/零宽度空格隐写/零宽度空间隐写/零宽隐写
零宽度字符隐写术（Zero-Width Space Steganography）：
将隐藏消息编码和解码为不可打印/可读字符。
字符包括：
零宽度空格（\u200b）
零宽度非连接符（\u200c）
零宽度连接符（\u200d）
从左至右书写标记（\u200e）
从右至左书写标记（\u200f）
解密
在线工具
https://www.mzy0.com/ctftools/zerowidth1/
http://330k.github.io/misc_tools/unicode_steganography.html
https://offdev.net/demos/zwsp-steg-js
其他工具
zwsp-steg-py
转换
转化为二进制的加密：https://zhuanlan.zhihu.com/p/87919817
转化为Morse编码的加密：https://zhuanlan.zhihu.com/p/75992161
JS脚本
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229/**
* Zero-Width Unicode Character Steganography
* Copyright (c) 2015-2016 Kei Misawa
* This software is released under the MIT License.
* http://opensource.org/licenses/mit-license.php
*/
(function(exports){
'use strict';
var chars = [];
var radix = 0;
var codelengthText = 0;
var codelengthBinary = 0;
/**
Set characters of coded hidden text(zero width characters)
args: string of zero width characters
return: null
*/
var setUseChars = function(newchars){
if(newchars.length >= 2){
chars = newchars.split('');
radix = chars.length;
codelengthText = Math.ceil(Math.log(65536) / Math.log(radix));
codelengthBinary = Math.ceil(Math.log(256) / Math.log(radix));
}
return null;
};
/**
Text Encoder
args:
text: original text to be embedded (String)
data: text to be hidden (String)
return: unicode stego text
*/
var encodeText = function(text1, text2){
return combine_shuffle_string(text1, encode_to_zerowidth_characters_text(text2), codelengthText);
};
/**
Binary Encoder
args:
text: original text to be embedded (String)
data: data to be hidden (Uint8Array)
return: unicode stego text
*/
var encodeBinary = function(text, data){
return combine_shuffle_string(text, encode_to_zerowidth_characters_binary(data), codelengthBinary);
};
/**
Text Decoder
args: unicode text with steganography (String)
return: JavaScript Object {
originalText: original text (String),
hiddenText: hidden data (String)
}
*/
var decodeText = function(text){
var splitted = split_zerowidth_characters(text);
return {
'originalText': splitted.originalText,
'hiddenText': decode_from_zero_width_characters_text(splitted.hiddenText, codelengthText)
};
};
/**
Binary Decoder
args: unicode text with steganography (String)
return: JavaScript Object {
originalText: original text (String),
hiddenData: hidden data (Uint8Array)
}
*/
var decodeBinary = function(text){
var splitted = split_zerowidth_characters(text);
return {
'originalText': splitted.originalText,
'hiddenData': decode_from_zero_width_characters_binary(splitted.hiddenText)
};
};
setUseChars('\u200c\u200d\u202c\ufeff');
exports.unicodeSteganographer = {
encodeText: encodeText,
decodeText: decodeText,
encodeBinary: encodeBinary,
decodeBinary: decodeBinary,
setUseChars: setUseChars
};
/**
Internal Functions
*/
var encode_to_zerowidth_characters_text = function(str1){
var result = new Array(str1.length);
var base = '';
var i;
var c;
var d;
var r;
//var base = '0'.repeat(codelength); // IE not support this method
for(i = 0; i < codelengthText; i++){
base += '0';
}
for(i = 0; i < str1.length; i++){
c = str1.charCodeAt(i);
d = c.toString(radix);
result[i] = (base + d).substr(-codelengthText);
}
r = result.join('');
for(i = 0; i < radix; i++){
r = r.replace(new RegExp(i, 'g'), chars[i]);
}
return r;
};
var encode_to_zerowidth_characters_binary = function(u8ary){
var result = new Array(u8ary.length);
var base = '';
var i;
var c;
var d;
var r;
for(i = 0; i < codelengthBinary; i++){
base += '0';
}
for(i = 0; i < u8ary.length; i++){
d = u8ary[i].toString(radix);
result[i] = (base + d).substr(-codelengthBinary);
}
r = result.join('');
for(i = 0; i < radix; i++){
r = r.replace(new RegExp(i, 'g'), chars[i]);
}
return r;
};
var combine_shuffle_string = function(str1, str2, codelength){
var result = [];
var c0 = str1.split(/([\u0000-\u002F\u003A-\u0040\u005b-\u0060\u007b-\u007f])|([\u0030-\u0039]+)|([\u0041-\u005a\u0061-\u007a]+)|([\u0080-\u00FF]+)|([\u0100-\u017F]+)|([\u0180-\u024F]+)|([\u0250-\u02AF]+)|([\u02B0-\u02FF]+)|([\u0300-\u036F]+)|([\u0370-\u03FF]+)|([\u0400-\u04FF]+)|([\u0500-\u052F]+)|([\u0530-\u058F]+)|([\u0590-\u05FF]+)|([\u0600-\u06FF]+)|([\u0700-\u074F]+)|([\u0750-\u077F]+)|([\u0780-\u07BF]+)|([\u07C0-\u07FF]+)|([\u0800-\u083F]+)|([\u0840-\u085F]+)|([\u08A0-\u08FF]+)|([\u0900-\u097F]+)|([\u0980-\u09FF]+)|([\u0A00-\u0A7F]+)|([\u0A80-\u0AFF]+)|([\u0B00-\u0B7F]+)|([\u0B80-\u0BFF]+)|([\u0C00-\u0C7F]+)|([\u0C80-\u0CFF]+)|([\u0D00-\u0D7F]+)|([\u0D80-\u0DFF]+)|([\u0E00-\u0E7F]+)|([\u0E80-\u0EFF]+)|([\u0F00-\u0FFF]+)|([\u1000-\u109F]+)|([\u10A0-\u10FF]+)|([\u1100-\u11FF]+)|([\u1200-\u137F]+)|([\u1380-\u139F]+)|([\u13A0-\u13FF]+)|([\u1400-\u167F]+)|([\u1680-\u169F]+)|([\u16A0-\u16FF]+)|([\u1700-\u171F]+)|([\u1720-\u173F]+)|([\u1740-\u175F]+)|([\u1760-\u177F]+)|([\u1780-\u17FF]+)|([\u1800-\u18AF]+)|([\u18B0-\u18FF]+)|([\u1900-\u194F]+)|([\u1950-\u197F]+)|([\u1980-\u19DF]+)|([\u19E0-\u19FF]+)|([\u1A00-\u1A1F]+)|([\u1A20-\u1AAF]+)|([\u1AB0-\u1AFF]+)|([\u1B00-\u1B7F]+)|([\u1B80-\u1BBF]+)|([\u1BC0-\u1BFF]+)|([\u1C00-\u1C4F]+)|([\u1C50-\u1C7F]+)|([\u1CC0-\u1CCF]+)|([\u1CD0-\u1CFF]+)|([\u1D00-\u1D7F]+)|([\u1D80-\u1DBF]+)|([\u1DC0-\u1DFF]+)|([\u1E00-\u1EFF]+)|([\u1F00-\u1FFF]+)|([\u2000-\u206F]+)|([\u2070-\u209F]+)|([\u20A0-\u20CF]+)|([\u20D0-\u20FF]+)|([\u2100-\u214F]+)|([\u2150-\u218F]+)|([\u2190-\u21FF]+)|([\u2200-\u22FF]+)|([\u2300-\u23FF]+)|([\u2400-\u243F]+)|([\u2440-\u245F]+)|([\u2460-\u24FF]+)|([\u2500-\u257F]+)|([\u2580-\u259F]+)|([\u25A0-\u25FF]+)|([\u2600-\u26FF]+)|([\u2700-\u27BF]+)|([\u27C0-\u27EF]+)|([\u27F0-\u27FF]+)|([\u2800-\u28FF]+)|([\u2900-\u297F]+)|([\u2980-\u29FF]+)|([\u2A00-\u2AFF]+)|([\u2B00-\u2BFF]+)|([\u2C00-\u2C5F]+)|([\u2C60-\u2C7F]+)|([\u2C80-\u2CFF]+)|([\u2D00-\u2D2F]+)|([\u2D30-\u2D7F]+)|([\u2D80-\u2DDF]+)|([\u2DE0-\u2DFF]+)|([\u2E00-\u2E7F]+)|([\u2E80-\u2EFF]+)|([\u2F00-\u2FDF]+)|([\u2FF0-\u2FFF]+)|([\u3000-\u303F]+)|([\u3040-\u309F]+)|([\u30A0-\u30FF]+)|([\u3100-\u312F]+)|([\u3130-\u318F]+)|([\u3190-\u319F]+)|([\u31A0-\u31BF]+)|([\u31C0-\u31EF]+)|([\u31F0-\u31FF]+)|([\u3200-\u32FF]+)|([\u3300-\u33FF]+)|([\u3400-\u4DBF]+)|([\u4DC0-\u4DFF]+)|([\u4E00-\u9FFF]+)|([\uA000-\uA48F]+)|([\uA490-\uA4CF]+)|([\uA4D0-\uA4FF]+)|([\uA500-\uA63F]+)|([\uA640-\uA69F]+)|([\uA6A0-\uA6FF]+)|([\uA700-\uA71F]+)|([\uA720-\uA7FF]+)|([\uA800-\uA82F]+)|([\uA830-\uA83F]+)|([\uA840-\uA87F]+)|([\uA880-\uA8DF]+)|([\uA8E0-\uA8FF]+)|([\uA900-\uA92F]+)|([\uA930-\uA95F]+)|([\uA960-\uA97F]+)|([\uA980-\uA9DF]+)|([\uA9E0-\uA9FF]+)|([\uAA00-\uAA5F]+)|([\uAA60-\uAA7F]+)|([\uAA80-\uAADF]+)|([\uAAE0-\uAAFF]+)|([\uAB00-\uAB2F]+)|([\uAB30-\uAB6F]+)|([\uAB70-\uABBF]+)|([\uABC0-\uABFF]+)|([\uAC00-\uD7AF]+)|([\uD7B0-\uD7FF]+)|([\uD800-\uDFFF]+)|([\uE000-\uF8FF]+)|([\uF900-\uFAFF]+)|([\uFB00-\uFB4F]+)|([\uFB50-\uFDFF]+)|([\uFE00-\uFE0F]+)|([\uFE10-\uFE1F]+)|([\uFE20-\uFE2F]+)|([\uFE30-\uFE4F]+)|([\uFE50-\uFE6F]+)|([\uFE70-\uFEFF]+)|([\uFF00-\uFFEF]+)|([\uFFF0-\uFFFF]+)/g);
var c1 = [];
var i;
var j;
for(i = 0; i < c0.length; i++){
if((typeof c0[i] !== 'undefined') && (c0[i] !== '')){
c1.push(c0[i]);
}
}
var c2 = str2.split(new RegExp('(.{' + codelength + '})', 'g'));
var ratio = c1.length / (c1.length + c2.length);
/* slow
while((c1.length > 0) && (c2.length > 0)){
if(Math.random() <= ratio){
result.push(c1.shift());
}else{
result.push(c2.shift());
}
}*/
i = 0;
j = 0;
while((i < c1.length) && (j < c2.length)){
if(Math.random() <= ratio){
result.push(c1[i]);
i++;
}else{
result.push(c2[j]);
j++;
}
}
c1 = c1.slice(i);
c2 = c2.slice(j);
result = result.concat(c1).concat(c2);
return result.join('');
};
var split_zerowidth_characters = function(str1){
var result = {};
result.originalText = str1.replace(new RegExp('[' + chars.join('') + ']', 'g'), '');
result.hiddenText = str1.replace(new RegExp('[^' + chars.join('') + ']', 'g'), '');
return result;
};
var decode_from_zero_width_characters_text = function(str1){
var r = str1;
var i;
var result = [];
for(i = 0; i < radix; i++){
r = r.replace(new RegExp(chars[i], 'g'), i);
}
for(i = 0; i < r.length; i += codelengthText){
result.push(String.fromCharCode(parseInt(r.substr(i, codelengthText), radix)));
}
return result.join('');
};
var decode_from_zero_width_characters_binary = function(str1){
var r = str1;
var i;
var j;
var result = new Uint8Array(Math.ceil(str1.length / codelengthBinary));
for(i = 0; i < radix; i++){
r = r.replace(new RegExp(chars[i], 'g'), i);
}
for(i = 0, j = 0; i < r.length; i += codelengthBinary, j++){
result[j] = parseInt(r.substr(i, codelengthBinary), radix);
}
return result;
};
return null;
})(this);
var s = unicodeSteganographer
s.setUseChars('\u200b\u200c\u200d\u200e\u200f');
s.decodeText("我已经看见了，你呢？")
