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
https://yuanfux.github.io/zero-width-web/
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
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？")
